diff --git a/lib/Slic3r/Config.pm b/lib/Slic3r/Config.pm
index 9f5de4f4..21fa2322 100644
--- a/lib/Slic3r/Config.pm
+++ b/lib/Slic3r/Config.pm
@@ -15,18 +15,18 @@ our $Options = print_config_def();
 {
     no strict 'refs';
     for my $opt_key (keys %$Options) {
-        *{$opt_key} = sub { $_[0]->_get($opt_key) };
+        *{$opt_key} = sub { $_[0]->get($opt_key) };
     }
 }
 
-sub _get {
-    my ($self, $opt_key) = @_;
-    use XXX;
-    if (!defined first { $_ eq $opt_key } @{$self->get_keys}) {
-        ZZZ $opt_key;
-    }
-    return $self->get($opt_key);
-}
+# sub _get {
+#     my ($self, $opt_key) = @_;
+#     use XXX;
+#     if (!defined first { $_ eq $opt_key } @{$self->get_keys}) {
+#         ZZZ $opt_key;
+#     }
+#     return $self->get($opt_key);
+# }
 
 sub new_from_defaults {
     my $class = shift;
@@ -200,7 +200,8 @@ sub diff {
     return [@diff];
 }
 
-# this method is idempotent by design
+# this method is idempotent by design and only applies to ::DynamicConfig or ::Full
+# objects because it performs cross checks
 sub validate {
     my $self = shift;
     
@@ -317,6 +318,31 @@ sub validate {
         if ($self->perimeter_acceleration || $self->infill_acceleration || $self->bridge_acceleration || $self->first_layer_acceleration)
             && !$self->default_acceleration;
     
+    # --spiral-vase
+    if ($self->spiral_vase) {
+        # Note that we might want to have more than one perimeter on the bottom
+        # solid layers.
+        die "Can't make more than one perimeter when spiral vase mode is enabled\n"
+            if $self->perimeters > 1;
+        
+        die "Can't make less than one perimeter when spiral vase mode is enabled\n"
+            if $self->perimeters < 1;
+        
+        die "Spiral vase mode is not compatible with non-zero fill density\n"
+            if $self->fill_density > 0;
+        
+        die "Spiral vase mode is not compatible with top solid layers\n"
+            if $self->top_solid_layers > 0;
+        
+        die "Spiral vase mode is not compatible with support material\n"
+            if $self->support_material || $self->support_material_enforce_layers > 0;
+        
+        # This should be enforce automatically only on spiral layers and
+        # done on the others
+        die "Spiral vase mode is not compatible with retraction on layer change\n"
+            if defined first { $_ } @{ $self->retract_layer_change };
+    }
+    
     # general validation, quick and dirty
     foreach my $opt_key (@{$self->get_keys}) {
         my $opt = $Options->{$opt_key};
diff --git a/lib/Slic3r/Extruder.pm b/lib/Slic3r/Extruder.pm
index 1025c345..9b8b1dc9 100644
--- a/lib/Slic3r/Extruder.pm
+++ b/lib/Slic3r/Extruder.pm
@@ -18,7 +18,7 @@ use constant OPTIONS => [qw(
 
 has 'id'    => (is => 'rw', required => 1);
 has $_      => (is => 'ro', required => 1) for @{&OPTIONS};
-has 'config'=> (is => 'ro', required => 1);
+has 'use_relative_e_distances'  => (is => 'ro', default => sub {0});
 
 has 'E'                         => (is => 'rw', default => sub {0} );
 has 'absolute_E'                => (is => 'rw', default => sub {0} );
@@ -56,7 +56,7 @@ sub scaled_wipe_distance {
 sub extrude {
     my ($self, $E) = @_;
     
-    $self->E(0) if $self->config->use_relative_e_distances;
+    $self->E(0) if $self->use_relative_e_distances;
     $self->absolute_E($self->absolute_E + $E);
     return $self->E($self->E + $E);
 }
diff --git a/lib/Slic3r/Fill.pm b/lib/Slic3r/Fill.pm
index 42cbea13..7969431c 100644
--- a/lib/Slic3r/Fill.pm
+++ b/lib/Slic3r/Fill.pm
@@ -1,6 +1,7 @@
 package Slic3r::Fill;
 use Moo;
 
+use Slic3r::ExtrusionPath ':roles';
 use Slic3r::Fill::ArchimedeanChords;
 use Slic3r::Fill::Base;
 use Slic3r::Fill::Concentric;
@@ -11,7 +12,7 @@ use Slic3r::Fill::Line;
 use Slic3r::Fill::OctagramSpiral;
 use Slic3r::Fill::PlanePath;
 use Slic3r::Fill::Rectilinear;
-use Slic3r::ExtrusionPath ':roles';
+use Slic3r::Flow ':roles';
 use Slic3r::Geometry qw(X Y PI scale chained_path);
 use Slic3r::Geometry::Clipper qw(union union_ex diff diff_ex intersection_ex offset offset2);
 use Slic3r::Surface ':types';
@@ -50,7 +51,10 @@ sub make_fill {
     my ($layerm) = @_;
     
     Slic3r::debugf "Filling layer %d:\n", $layerm->id;
-    my $fill_density = $layerm->config->fill_density;
+    
+    my $fill_density        = $layerm->config->fill_density;
+    my $infill_flow         = $layerm->flow(FLOW_ROLE_INFILL);
+    my $solid_infill_flow   = $layerm->flow(FLOW_ROLE_SOLID_INFILL);
     
     my @surfaces = ();
     
@@ -95,7 +99,7 @@ sub make_fill {
     # we are going to grow such regions by overlapping them with the void (if any)
     # TODO: detect and investigate whether there could be narrow regions without
     # any void neighbors
-    my $distance_between_surfaces = $layerm->solid_infill_flow->scaled_spacing * &Slic3r::INFILL_OVERLAP_OVER_SPACING;
+    my $distance_between_surfaces = $infill_flow->scaled_spacing * &Slic3r::INFILL_OVERLAP_OVER_SPACING;
     {
         my $collapsed = diff(
             [ map @{$_->expolygon}, @surfaces ],
@@ -133,11 +137,10 @@ sub make_fill {
         my $filler          = $layerm->config->fill_pattern;
         my $density         = $fill_density;
         my $flow            = ($surface->surface_type == S_TYPE_TOP)
-            ? $layerm->top_infill_flow
+            ? $layerm->flow(FLOW_ROLE_TOP_SOLID_INFILL)
             : $surface->is_solid
-                ? $layerm->solid_infill_flow
-                : $layerm->infill_flow;
-        my $flow_spacing    = $flow->spacing;
+                ? $solid_infill_flow
+                : $infill_flow;
         my $is_bridge       = $layerm->id > 0 && $surface->is_bridge;
         my $is_solid        = $surface->is_solid;
         
@@ -147,7 +150,7 @@ sub make_fill {
             $filler = $layerm->config->solid_fill_pattern;
             if ($is_bridge) {
                 $filler = 'rectilinear';
-                $flow_spacing = $layerm->extruders->{infill}->bridge_flow->spacing;
+                $flow = $layerm->flow(FLOW_ROLE_SOLID_INFILL, 1);
             } elsif ($surface->surface_type == S_TYPE_INTERNALSOLID) {
                 $filler = 'rectilinear';
             }
@@ -155,6 +158,8 @@ sub make_fill {
             next SURFACE unless $density > 0;
         }
         
+        my $flow_spacing = $flow->spacing;
+        
         my $f = $self->filler($filler);
         $f->layer_id($layerm->id);
         $f->angle($layerm->config->fill_angle);
@@ -166,7 +171,7 @@ sub make_fill {
         next unless @polylines;
         
         # ugly hack(tm) to get the right amount of flow (GCode.pm should be fixed)
-        $params->{flow_spacing} = $layerm->extruders->{infill}->bridge_flow->width if $is_bridge;
+        $params->{flow_spacing} = $flow->width if $is_bridge;
         
         # save into layer
         push @fills, my $collection = Slic3r::ExtrusionPath::Collection->new;
diff --git a/lib/Slic3r/Flow.pm b/lib/Slic3r/Flow.pm
index 0a9747fa..3930dce5 100644
--- a/lib/Slic3r/Flow.pm
+++ b/lib/Slic3r/Flow.pm
@@ -36,7 +36,10 @@ sub BUILDARGS {
             $args{width} = $args{layer_height} * $1 / 100;
         }
         $args{spacing} = $self->_spacing(@args{qw(width nozzle_diameter layer_height bridge_flow_ratio)});
-        %args = @args{qw(width spacing)};
+        %args = (
+            width   => $args{width},
+            spacing => $args{spacing},
+        );
     }
     
     return {%args};
diff --git a/lib/Slic3r/GCode.pm b/lib/Slic3r/GCode.pm
index da55942f..66175260 100644
--- a/lib/Slic3r/GCode.pm
+++ b/lib/Slic3r/GCode.pm
@@ -3,11 +3,12 @@ use Moo;
 
 use List::Util qw(min first);
 use Slic3r::ExtrusionPath ':roles';
+use Slic3r::Flow ':roles';
 use Slic3r::Geometry qw(epsilon scale unscale scaled_epsilon points_coincide PI X Y B);
 use Slic3r::Geometry::Clipper qw(union_ex);
 use Slic3r::Surface ':types';
 
-has 'config'             => (is => 'ro', required => 1);
+has 'print_config'       => (is => 'ro', default => sub { Slic3r::Config::Print->new });
 has 'extra_variables'    => (is => 'rw', default => sub {{}});
 has 'extruders'          => (is => 'ro', required => 1);
 has 'multiple_extruders' => (is => 'lazy');
@@ -16,6 +17,7 @@ has 'enable_loop_clipping' => (is => 'rw', default => sub {1});
 has 'enable_wipe'        => (is => 'lazy');   # at least one extruder has wipe enabled
 has 'layer_count'        => (is => 'ro', required => 1 );
 has 'layer'              => (is => 'rw');
+has 'region'             => (is => 'rw');
 has '_layer_islands'     => (is => 'rw');
 has '_upper_layer_islands'  => (is => 'rw');
 has '_layer_overhangs'   => (is => 'ro', default => sub { Slic3r::ExPolygon::Collection->new });
@@ -23,6 +25,8 @@ has 'shift_x'            => (is => 'rw', default => sub {0} );
 has 'shift_y'            => (is => 'rw', default => sub {0} );
 has 'z'                  => (is => 'rw');
 has 'speed'              => (is => 'rw');
+has '_extrusion_axis'    => (is => 'rw');
+has '_retract_lift'      => (is => 'rw');
 
 has 'speeds'             => (is => 'lazy');  # mm/min
 has 'external_mp'        => (is => 'rw');
@@ -38,12 +42,19 @@ has 'last_f'             => (is => 'rw', default => sub {""});
 has 'last_fan_speed'     => (is => 'rw', default => sub {0});
 has 'wipe_path'          => (is => 'rw');
 
+sub BUILD {
+    my ($self) = @_;
+    
+    $self->_extrusion_axis($self->print_config->get_extrusion_axis);
+    $self->_retract_lift($self->print_config->retract_lift->[0]);
+}
+
 sub _build_speeds {
     my $self = shift;
     return {
-        map { $_ => 60 * $self->config->get_value("${_}_speed") }
+        map { $_ => 60 * $self->print_config->get_value("${_}_speed") }
             qw(travel perimeter small_perimeter external_perimeter infill
-                solid_infill top_solid_infill support_material bridge gap_fill retract),
+                solid_infill top_solid_infill bridge gap_fill retract),
     };
 }
 
@@ -59,7 +70,6 @@ my %role_speeds = (
     &EXTR_ROLE_BRIDGE                       => 'bridge',
     &EXTR_ROLE_INTERNALBRIDGE               => 'solid_infill',
     &EXTR_ROLE_SKIRT                        => 'perimeter',
-    &EXTR_ROLE_SUPPORTMATERIAL              => 'support_material',
     &EXTR_ROLE_GAPFILL                      => 'gap_fill',
 );
 
@@ -97,29 +107,29 @@ sub change_layer {
     $self->_layer_islands($layer->islands);
     $self->_upper_layer_islands($layer->upper_layer ? $layer->upper_layer->islands : []);
     $self->_layer_overhangs->clear;
-    if ($layer->id > 0 && ($layer->config->overhangs || $self->config->start_perimeters_at_non_overhang)) {
+    if ($layer->id > 0 && ($self->print_config->overhangs || $self->print_config->start_perimeters_at_non_overhang)) {
         $self->_layer_overhangs->append(
             # clone ExPolygons because they come from Surface objects but will be used outside here
             map $_->expolygon, map @{$_->slices->filter_by_type(S_TYPE_BOTTOM)}, @{$layer->regions}
         );
     }
-    if ($self->config->avoid_crossing_perimeters) {
+    if ($self->print_config->avoid_crossing_perimeters) {
         $self->layer_mp(Slic3r::GCode::MotionPlanner->new(
             islands => union_ex([ map @$_, @{$layer->slices} ], 1),
         ));
     }
     
     my $gcode = "";
-    if ($self->config->gcode_flavor =~ /^(?:makerware|sailfish)$/) {
+    if ($self->print_config->gcode_flavor =~ /^(?:makerware|sailfish)$/) {
         $gcode .= sprintf "M73 P%s%s\n",
             int(99 * ($layer->id / ($self->layer_count - 1))),
-            ($self->config->gcode_comments ? ' ; update progress' : '');
+            ($self->print_config->gcode_comments ? ' ; update progress' : '');
     }
-    if ($self->config->first_layer_acceleration) {
+    if ($self->print_config->first_layer_acceleration) {
         if ($layer->id == 0) {
-            $gcode .= $self->set_acceleration($self->config->first_layer_acceleration);
+            $gcode .= $self->set_acceleration($self->print_config->first_layer_acceleration);
         } elsif ($layer->id == 1) {
-            $gcode .= $self->set_acceleration($self->config->default_acceleration);
+            $gcode .= $self->set_acceleration($self->print_config->default_acceleration);
         }
     }
     
@@ -133,7 +143,7 @@ sub move_z {
     
     my $gcode = "";
     
-    $z += $self->config->z_offset;
+    $z += $self->print_config->z_offset;
     my $current_z = $self->z;
     my $nominal_z = defined $current_z ? ($current_z - $self->lifted) : undef;
     
@@ -181,11 +191,11 @@ sub extrude_loop {
     # find candidate starting points
     # start looking for concave vertices not being overhangs
     my @concave = ();
-    if ($self->config->start_perimeters_at_concave_points) {
+    if ($self->print_config->start_perimeters_at_concave_points) {
         @concave = $polygon->concave_points;
     }
     my @candidates = ();
-    if ($self->config->start_perimeters_at_non_overhang) {
+    if ($self->print_config->start_perimeters_at_non_overhang) {
         @candidates = grep !$self->_layer_overhangs->contains_point($_), @concave;
     }
     if (!@candidates) {
@@ -193,7 +203,7 @@ sub extrude_loop {
         @candidates = @concave;
         if (!@candidates) {
             # if none, look for any non-overhang vertex
-            if ($self->config->start_perimeters_at_non_overhang) {
+            if ($self->print_config->start_perimeters_at_non_overhang) {
                 @candidates = grep !$self->_layer_overhangs->contains_point($_), @$polygon;
             }
             if (!@candidates) {
@@ -206,9 +216,9 @@ sub extrude_loop {
     # find the point of the loop that is closest to the current extruder position
     # or randomize if requested
     my $last_pos = $self->last_pos;
-    if ($self->config->randomize_start && $loop->role == EXTR_ROLE_CONTOUR_INTERNAL_PERIMETER) {
-        $last_pos = Slic3r::Point->new(scale $self->config->print_center->[X], scale $self->config->bed_size->[Y]);
-        $last_pos->rotate(rand(2*PI), $self->config->print_center);
+    if ($self->print_config->randomize_start && $loop->role == EXTR_ROLE_CONTOUR_INTERNAL_PERIMETER) {
+        $last_pos = Slic3r::Point->new(scale $self->print_config->print_center->[X], scale $self->print_config->bed_size->[Y]);
+        $last_pos->rotate(rand(2*PI), $self->print_config->print_center);
     }
     
     # split the loop at the starting point and make a path
@@ -224,7 +234,7 @@ sub extrude_loop {
     
     my @paths = ();
     # detect overhanging/bridging perimeters
-    if ($self->layer->config->overhangs && $extrusion_path->is_perimeter && $self->_layer_overhangs->count > 0) {
+    if ($self->layer->print->config->overhangs && $extrusion_path->is_perimeter && $self->_layer_overhangs->count > 0) {
         # get non-overhang paths by subtracting overhangs from the loop
         push @paths,
             map $_->clone,
@@ -234,7 +244,7 @@ sub extrude_loop {
         push @paths,
             map {
                 $_->role(EXTR_ROLE_OVERHANG_PERIMETER);
-                $_->flow_spacing($self->extruder->bridge_flow->width);
+                $_->flow_spacing($self->region->flow(FLOW_ROLE_PERIMETER, undef, 1)->width);
                 $_
             }
             map $_->clone,
@@ -259,7 +269,7 @@ sub extrude_loop {
     $self->wipe_path($extrusion_path->polyline->clone) if $self->enable_wipe;
     
     # make a little move inwards before leaving loop
-    if ($loop->role == EXTR_ROLE_EXTERNAL_PERIMETER && defined $self->layer && $self->layer->object->config->perimeters > 1) {
+    if ($loop->role == EXTR_ROLE_EXTERNAL_PERIMETER && defined $self->layer && $self->region->config->perimeters > 1) {
         # detect angle between last and first segment
         # the side depends on the original winding order of the polygon (left for contours, right for holes)
         my @points = $was_clockwise ? (-2, 1) : (1, -2);
@@ -299,13 +309,13 @@ sub extrude_path {
     
     # adjust acceleration
     my $acceleration;
-    if (!$self->config->first_layer_acceleration || $self->layer->id != 0) {
-        if ($self->config->perimeter_acceleration && $path->is_perimeter) {
-            $acceleration = $self->config->perimeter_acceleration;
-        } elsif ($self->config->infill_acceleration && $path->is_fill) {
-            $acceleration = $self->config->infill_acceleration;
-        } elsif ($self->config->infill_acceleration && $path->is_bridge) {
-            $acceleration = $self->config->bridge_acceleration;
+    if (!$self->print_config->first_layer_acceleration || $self->layer->id != 0) {
+        if ($self->print_config->perimeter_acceleration && $path->is_perimeter) {
+            $acceleration = $self->print_config->perimeter_acceleration;
+        } elsif ($self->print_config->infill_acceleration && $path->is_fill) {
+            $acceleration = $self->print_config->infill_acceleration;
+        } elsif ($self->print_config->infill_acceleration && $path->is_bridge) {
+            $acceleration = $self->print_config->bridge_acceleration;
         }
         $gcode .= $self->set_acceleration($acceleration) if $acceleration;
     }
@@ -322,15 +332,13 @@ sub extrude_path {
     
     # calculate extrusion length per distance unit
     my $e = $self->extruder->e_per_mm3 * $area;
-    $e = 0 if !$self->config->extrusion_axis;
+    $e = 0 if !$self->_extrusion_axis;
     
     # set speed
     $self->speed( $params{speed} || $role_speeds{$path->role} || die "Unknown role: " . $path->role );
     my $F = $self->speeds->{$self->speed} // $self->speed;
     if ($self->layer->id == 0) {
-        $F = $self->config->first_layer_speed =~ /^(\d+(?:\.\d+)?)%$/
-            ? sprintf("%.3f", $F * $1/100)
-            : $self->config->first_layer_speed * 60;
+        $F = $self->print_config->get_abs_value_over('first_layer_speed', $F/60) * 60;
     }
     
     # extrude arc or line
@@ -350,12 +358,12 @@ sub extrude_path {
             $gcode .= sprintf "G1 X%.3f Y%.3f",
                 ($point->x * &Slic3r::SCALING_FACTOR) + $self->shift_x - $self->extruder->extruder_offset->[X], 
                 ($point->y * &Slic3r::SCALING_FACTOR) + $self->shift_y - $self->extruder->extruder_offset->[Y];  #**
-            $gcode .= sprintf(" %s%.5f", $self->config->extrusion_axis, $E)
+            $gcode .= sprintf(" %s%.5f", $self->_extrusion_axis, $E)
                 if $E;
             $gcode .= " F$local_F"
                 if $local_F;
             $gcode .= " ; $description"
-                if $self->config->gcode_comments;
+                if $self->print_config->gcode_comments;
             $gcode .= "\n";
             
             # only include F in the first line
@@ -369,19 +377,14 @@ sub extrude_path {
     $gcode .= ";_BRIDGE_FAN_END\n" if $path->is_bridge;
     $self->last_pos($path->last_point);
     
-    if ($self->config->cooling) {
+    if ($self->print_config->cooling) {
         my $path_time = $path_length / $F * 60;
-        if ($self->layer->id == 0) {
-            $path_time = $self->config->first_layer_speed =~ /^(\d+(?:\.\d+)?)%$/
-                ? $path_time / ($1/100)
-                : $path_length / $self->config->first_layer_speed * 60;
-        }
         $self->elapsed_time($self->elapsed_time + $path_time);
     }
     
     # reset acceleration
-    $gcode .= $self->set_acceleration($self->config->default_acceleration)
-        if $acceleration && $self->config->default_acceleration;
+    $gcode .= $self->set_acceleration($self->print_config->default_acceleration)
+        if $acceleration && $self->print_config->default_acceleration;
     
     return $gcode;
 }
@@ -400,7 +403,7 @@ sub travel_to {
     # skip retraction if the travel move is contained in an island in the current layer
     # *and* in an island in the upper layer (so that the ooze will not be visible)
     if ($travel->length < scale $self->extruder->retract_before_travel
-        || ($self->config->only_retract_when_crossing_perimeters
+        || ($self->print_config->only_retract_when_crossing_perimeters
             && (first { $_->contains_line($travel) } @{$self->_upper_layer_islands})
             && (first { $_->contains_line($travel) } @{$self->_layer_islands}))
         || (defined $role && $role == EXTR_ROLE_SUPPORTMATERIAL && (first { $_->contains_line($travel) } @{$self->layer->support_islands}))
@@ -408,7 +411,7 @@ sub travel_to {
         $self->straight_once(0);
         $self->speed('travel');
         $gcode .= $self->G0($point, undef, 0, $comment || "");
-    } elsif (!$self->config->avoid_crossing_perimeters || $self->straight_once) {
+    } elsif (!$self->print_config->avoid_crossing_perimeters || $self->straight_once) {
         $self->straight_once(0);
         $gcode .= $self->retract;
         $self->speed('travel');
@@ -441,7 +444,7 @@ sub _plan {
     my @travel = @{$mp->shortest_path($self->last_pos, $point)->lines};
     
     # if the path is not contained in a single island we need to retract
-    my $need_retract = !$self->config->only_retract_when_crossing_perimeters;
+    my $need_retract = !$self->print_config->only_retract_when_crossing_perimeters;
     if (!$need_retract) {
         $need_retract = 1;
         foreach my $island (@{$self->_upper_layer_islands}) {
@@ -481,14 +484,14 @@ sub retract {
     if ($self->extruder->wipe && $self->wipe_path) {
         my @points = @{$self->wipe_path};
         $wipe_path = Slic3r::Polyline->new($self->last_pos, @{$self->wipe_path}[1..$#{$self->wipe_path}]);
-        $wipe_path->clip_end($wipe_path->length - $self->extruder->scaled_wipe_distance($self->config->travel_speed));
+        $wipe_path->clip_end($wipe_path->length - $self->extruder->scaled_wipe_distance($self->print_config->travel_speed));
     }
     
     # prepare moves
     my $retract = [undef, undef, -$length, $comment];
-    my $lift    = ($self->extruder->retract_lift == 0 || defined $params{move_z}) && !$self->lifted
+    my $lift    = ($self->_retract_lift == 0 || defined $params{move_z}) && !$self->lifted
         ? undef
-        : [undef, $self->z + $self->extruder->retract_lift, 0, 'lift plate during travel'];
+        : [undef, $self->z + $self->_retract_lift, 0, 'lift plate during travel'];
     
     # check that we have a positive wipe length
     if ($wipe_path) {
@@ -500,7 +503,7 @@ sub retract {
             my $segment_length = $line->length;
             # reduce retraction length a bit to avoid effective retraction speed to be greater than the configured one
             # due to rounding
-            my $e = $retract->[2] * ($segment_length / $self->extruder->scaled_wipe_distance($self->config->travel_speed)) * 0.95;
+            my $e = $retract->[2] * ($segment_length / $self->extruder->scaled_wipe_distance($self->print_config->travel_speed)) * 0.95;
             $retracted += $e;
             $gcode .= $self->G1($line->b, undef, $e, $retract->[3] . ";_WIPE");
         }
@@ -510,7 +513,7 @@ sub retract {
             $self->speed('retract');
             $gcode .= $self->G1(undef, undef, $retract->[2] - $retracted, $comment);
         }
-    } elsif ($self->config->use_firmware_retraction) {
+    } elsif ($self->print_config->use_firmware_retraction) {
         $gcode .= "G10 ; retract\n";
     } else {
         $self->speed('retract');
@@ -518,23 +521,23 @@ sub retract {
     }
     if (!$self->lifted) {
         $self->speed('travel');
-        if (defined $params{move_z} && $self->extruder->retract_lift > 0) {
-            my $travel = [undef, $params{move_z} + $self->extruder->retract_lift, 0, 'move to next layer (' . $self->layer->id . ') and lift'];
+        if (defined $params{move_z} && $self->_retract_lift > 0) {
+            my $travel = [undef, $params{move_z} + $self->_retract_lift, 0, 'move to next layer (' . $self->layer->id . ') and lift'];
             $gcode .= $self->G0(@$travel);
-            $self->lifted($self->extruder->retract_lift);
+            $self->lifted($self->_retract_lift);
         } elsif ($lift) {
             $gcode .= $self->G1(@$lift);
         }
     }
     $self->extruder->retracted($self->extruder->retracted + $length);
     $self->extruder->restart_extra($restart_extra);
-    $self->lifted($self->extruder->retract_lift) if $lift;
+    $self->lifted($self->_retract_lift) if $lift;
     
     # reset extrusion distance during retracts
     # this makes sure we leave sufficient precision in the firmware
     $gcode .= $self->reset_e;
     
-    $gcode .= "M103 ; extruder off\n" if $self->config->gcode_flavor eq 'makerware';
+    $gcode .= "M103 ; extruder off\n" if $self->print_config->gcode_flavor eq 'makerware';
     
     return $gcode;
 }
@@ -543,7 +546,7 @@ sub unretract {
     my ($self) = @_;
     
     my $gcode = "";
-    $gcode .= "M101 ; extruder on\n" if $self->config->gcode_flavor eq 'makerware';
+    $gcode .= "M101 ; extruder on\n" if $self->print_config->gcode_flavor eq 'makerware';
     
     if ($self->lifted) {
         $self->speed('travel');
@@ -554,15 +557,15 @@ sub unretract {
     my $to_unretract = $self->extruder->retracted + $self->extruder->restart_extra;
     if ($to_unretract) {
         $self->speed('retract');
-        if ($self->config->use_firmware_retraction) {
+        if ($self->print_config->use_firmware_retraction) {
             $gcode .= "G11 ; unretract\n";
-        } elsif ($self->config->extrusion_axis) {
+        } elsif ($self->_extrusion_axis) {
             # use G1 instead of G0 because G0 will blend the restart with the previous travel move
             $gcode .= sprintf "G1 %s%.5f F%.3f",
-                $self->config->extrusion_axis,
+                $self->_extrusion_axis,
                 $self->extruder->extrude($to_unretract),
                 $self->extruder->retract_speed_mm_min;
-            $gcode .= " ; compensate retraction" if $self->config->gcode_comments;
+            $gcode .= " ; compensate retraction" if $self->print_config->gcode_comments;
             $gcode .= "\n";
         }
         $self->extruder->retracted(0);
@@ -574,11 +577,11 @@ sub unretract {
 
 sub reset_e {
     my ($self) = @_;
-    return "" if $self->config->gcode_flavor =~ /^(?:mach3|makerware|sailfish)$/;
+    return "" if $self->print_config->gcode_flavor =~ /^(?:mach3|makerware|sailfish)$/;
     
     $self->extruder->E(0) if $self->extruder;
-    return sprintf "G92 %s0%s\n", $self->config->extrusion_axis, ($self->config->gcode_comments ? ' ; reset extrusion distance' : '')
-        if $self->config->extrusion_axis && !$self->config->use_relative_e_distances;
+    return sprintf "G92 %s0%s\n", $self->_extrusion_axis, ($self->print_config->gcode_comments ? ' ; reset extrusion distance' : '')
+        if $self->_extrusion_axis && !$self->print_config->use_relative_e_distances;
 }
 
 sub set_acceleration {
@@ -586,12 +589,12 @@ sub set_acceleration {
     return "" if !$acceleration;
     
     return sprintf "M204 S%s%s\n",
-        $acceleration, ($self->config->gcode_comments ? ' ; adjust acceleration' : '');
+        $acceleration, ($self->print_config->gcode_comments ? ' ; adjust acceleration' : '');
 }
 
 sub G0 {
     my $self = shift;
-    return $self->G1(@_) if !($self->config->g0 || $self->config->gcode_flavor eq 'mach3');
+    return $self->G1(@_) if !($self->print_config->g0 || $self->print_config->gcode_flavor eq 'mach3');
     return $self->_G0_G1("G0", @_);
 }
 
@@ -628,11 +631,11 @@ sub _Gx {
     $gcode .= sprintf " F%.3f", $F;
     
     # output extrusion distance
-    if ($e && $self->config->extrusion_axis) {
-        $gcode .= sprintf " %s%.5f", $self->config->extrusion_axis, $self->extruder->extrude($e);
+    if ($e && $self->_extrusion_axis) {
+        $gcode .= sprintf " %s%.5f", $self->_extrusion_axis, $self->extruder->extrude($e);
     }
     
-    $gcode .= " ; $comment" if $comment && $self->config->gcode_comments;
+    $gcode .= " ; $comment" if $comment && $self->print_config->gcode_comments;
     return "$gcode\n";
 }
 
@@ -653,8 +656,8 @@ sub set_extruder {
     $gcode .= $self->retract(toolchange => 1) if defined $self->extruder;
     
     # append custom toolchange G-code
-    if (defined $self->extruder && $self->config->toolchange_gcode) {
-        $gcode .= sprintf "%s\n", $self->replace_variables($self->config->toolchange_gcode, {
+    if (defined $self->extruder && $self->print_config->toolchange_gcode) {
+        $gcode .= sprintf "%s\n", $self->replace_variables($self->print_config->toolchange_gcode, {
             previous_extruder   => $self->extruder->id,
             next_extruder       => $extruder->id,
         });
@@ -669,24 +672,24 @@ sub set_extruder {
             ? $self->extruder->first_layer_temperature
             : $self->extruder->temperature;
         # we assume that heating is always slower than cooling, so no need to block
-        $gcode .= $self->set_temperature($temp + $self->config->standby_temperature_delta, 0);
+        $gcode .= $self->set_temperature($temp + $self->print_config->standby_temperature_delta, 0);
     }
     
     # set the new extruder
     $self->extruder($extruder);
     $gcode .= sprintf "%s%d%s\n", 
-        ($self->config->gcode_flavor eq 'makerware'
+        ($self->print_config->gcode_flavor eq 'makerware'
             ? 'M135 T'
-            : $self->config->gcode_flavor eq 'sailfish'
+            : $self->print_config->gcode_flavor eq 'sailfish'
                 ? 'M108 T'
                 : 'T'),
         $extruder->id,
-        ($self->config->gcode_comments ? ' ; change extruder' : '');
+        ($self->print_config->gcode_comments ? ' ; change extruder' : '');
     
     $gcode .= $self->reset_e;
     
     # set the new extruder to the operating temperature
-    if ($self->config->ooze_prevention) {
+    if ($self->print_config->ooze_prevention) {
         my $temp = defined $self->layer && $self->layer->id == 0
             ? $self->extruder->first_layer_temperature
             : $self->extruder->temperature;
@@ -702,18 +705,18 @@ sub set_fan {
     if ($self->last_fan_speed != $speed || $dont_save) {
         $self->last_fan_speed($speed) if !$dont_save;
         if ($speed == 0) {
-            my $code = $self->config->gcode_flavor eq 'teacup'
+            my $code = $self->print_config->gcode_flavor eq 'teacup'
                 ? 'M106 S0'
-                : $self->config->gcode_flavor =~ /^(?:makerware|sailfish)$/
+                : $self->print_config->gcode_flavor =~ /^(?:makerware|sailfish)$/
                     ? 'M127'
                     : 'M107';
-            return sprintf "$code%s\n", ($self->config->gcode_comments ? ' ; disable fan' : '');
+            return sprintf "$code%s\n", ($self->print_config->gcode_comments ? ' ; disable fan' : '');
         } else {
-            if ($self->config->gcode_flavor =~ /^(?:makerware|sailfish)$/) {
-                return sprintf "M126%s\n", ($self->config->gcode_comments ? ' ; enable fan' : '');
+            if ($self->print_config->gcode_flavor =~ /^(?:makerware|sailfish)$/) {
+                return sprintf "M126%s\n", ($self->print_config->gcode_comments ? ' ; enable fan' : '');
             } else {
-                return sprintf "M106 %s%d%s\n", ($self->config->gcode_flavor eq 'mach3' ? 'P' : 'S'),
-                    (255 * $speed / 100), ($self->config->gcode_comments ? ' ; enable fan' : '');
+                return sprintf "M106 %s%d%s\n", ($self->print_config->gcode_flavor eq 'mach3' ? 'P' : 'S'),
+                    (255 * $speed / 100), ($self->print_config->gcode_comments ? ' ; enable fan' : '');
             }
         }
     }
@@ -723,17 +726,17 @@ sub set_fan {
 sub set_temperature {
     my ($self, $temperature, $wait, $tool) = @_;
     
-    return "" if $wait && $self->config->gcode_flavor =~ /^(?:makerware|sailfish)$/;
+    return "" if $wait && $self->print_config->gcode_flavor =~ /^(?:makerware|sailfish)$/;
     
-    my ($code, $comment) = ($wait && $self->config->gcode_flavor ne 'teacup')
+    my ($code, $comment) = ($wait && $self->print_config->gcode_flavor ne 'teacup')
         ? ('M109', 'wait for temperature to be reached')
         : ('M104', 'set temperature');
     my $gcode = sprintf "$code %s%d %s; $comment\n",
-        ($self->config->gcode_flavor eq 'mach3' ? 'P' : 'S'), $temperature,
-        (defined $tool && ($self->multiple_extruders || $self->config->gcode_flavor =~ /^(?:makerware|sailfish)$/)) ? "T$tool " : "";
+        ($self->print_config->gcode_flavor eq 'mach3' ? 'P' : 'S'), $temperature,
+        (defined $tool && ($self->multiple_extruders || $self->print_config->gcode_flavor =~ /^(?:makerware|sailfish)$/)) ? "T$tool " : "";
     
     $gcode .= "M116 ; wait for temperature to be reached\n"
-        if $self->config->gcode_flavor eq 'teacup' && $wait;
+        if $self->print_config->gcode_flavor eq 'teacup' && $wait;
     
     return $gcode;
 }
@@ -741,21 +744,21 @@ sub set_temperature {
 sub set_bed_temperature {
     my ($self, $temperature, $wait) = @_;
     
-    my ($code, $comment) = ($wait && $self->config->gcode_flavor ne 'teacup')
-        ? (($self->config->gcode_flavor =~ /^(?:makerware|sailfish)$/ ? 'M109' : 'M190'), 'wait for bed temperature to be reached')
+    my ($code, $comment) = ($wait && $self->print_config->gcode_flavor ne 'teacup')
+        ? (($self->print_config->gcode_flavor =~ /^(?:makerware|sailfish)$/ ? 'M109' : 'M190'), 'wait for bed temperature to be reached')
         : ('M140', 'set bed temperature');
     my $gcode = sprintf "$code %s%d ; $comment\n",
-        ($self->config->gcode_flavor eq 'mach3' ? 'P' : 'S'), $temperature;
+        ($self->print_config->gcode_flavor eq 'mach3' ? 'P' : 'S'), $temperature;
     
     $gcode .= "M116 ; wait for bed temperature to be reached\n"
-        if $self->config->gcode_flavor eq 'teacup' && $wait;
+        if $self->print_config->gcode_flavor eq 'teacup' && $wait;
     
     return $gcode;
 }
 
 sub replace_variables {
     my ($self, $string, $extra) = @_;
-    return $self->config->replace_options($string, { %{$self->extra_variables}, %{ $extra || {} } });
+    return $self->print_config->replace_options($string, { %{$self->extra_variables}, %{ $extra || {} } });
 }
 
 1;
diff --git a/lib/Slic3r/GCode/ArcFitting.pm b/lib/Slic3r/GCode/ArcFitting.pm
index 52078bdc..fe45bdb3 100644
--- a/lib/Slic3r/GCode/ArcFitting.pm
+++ b/lib/Slic3r/GCode/ArcFitting.pm
@@ -104,7 +104,7 @@ sub flush_path {
         $gcode .= sprintf " I%.3f J%.3f", map { unscale($arc_center->[$_] - $cur_path->[0][$_]) } (X,Y);
         
         my $E = 0;  # TODO: compute E using $length
-        $gcode .= sprintf(" %s%.5f", $self->config->extrusion_axis, $E)
+        $gcode .= sprintf(" %s%.5f", $self->config->get_extrusion_axis, $E)
             if $E;
         
         my $F = 0;  # TODO: extract F from original moves
diff --git a/lib/Slic3r/GCode/CoolingBuffer.pm b/lib/Slic3r/GCode/CoolingBuffer.pm
index d95b5fec..91119fe3 100644
--- a/lib/Slic3r/GCode/CoolingBuffer.pm
+++ b/lib/Slic3r/GCode/CoolingBuffer.pm
@@ -1,7 +1,7 @@
 package Slic3r::GCode::CoolingBuffer;
 use Moo;
 
-has 'config'    => (is => 'ro', required => 1);
+has 'config'    => (is => 'ro', required => 1);  # Slic3r::Config::Print
 has 'gcodegen'  => (is => 'ro', required => 1);
 has 'gcode'     => (is => 'rw', default => sub {""});
 has 'elapsed_time' => (is => 'rw', default => sub {0});
diff --git a/lib/Slic3r/GCode/Layer.pm b/lib/Slic3r/GCode/Layer.pm
index f888ddac..f64b6a1b 100644
--- a/lib/Slic3r/GCode/Layer.pm
+++ b/lib/Slic3r/GCode/Layer.pm
@@ -19,24 +19,24 @@ has '_last_obj_copy'                => (is => 'rw');
 sub _build_spiralvase {
     my $self = shift;
     
-    return $self->gcodegen->config->spiral_vase
-        ? Slic3r::GCode::SpiralVase->new(config => $self->gcodegen->config)
+    return $self->print->config->spiral_vase
+        ? Slic3r::GCode::SpiralVase->new(config => $self->print->config)
         : undef;
 }
 
 sub _build_vibration_limit {
     my $self = shift;
     
-    return $self->gcodegen->config->vibration_limit
-        ? Slic3r::GCode::VibrationLimit->new(config => $self->gcodegen->config)
+    return $self->print->config->vibration_limit
+        ? Slic3r::GCode::VibrationLimit->new(config => $self->print->config)
         : undef;
 }
 
 sub _build_arc_fitting {
     my $self = shift;
     
-    return $self->gcodegen->config->gcode_arcs
-        ? Slic3r::GCode::ArcFitting->new(config => $self->gcodegen->config)
+    return $self->print->config->gcode_arcs
+        ? Slic3r::GCode::ArcFitting->new(config => $self->print->config)
         : undef;
 }
 
@@ -45,44 +45,46 @@ sub process_layer {
     my ($layer, $object_copies) = @_;
     my $gcode = "";
     
+    my $object = $layer->object;
+    
     # check whether we're going to apply spiralvase logic
     my $spiralvase = defined $self->spiralvase
-        && ($layer->id > 0 || $self->gcodegen->config->brim_width == 0)
-        && ($layer->id >= $self->gcodegen->config->skirt_height && $self->gcodegen->config->skirt_height != -1)
-        && ($layer->id >= $self->gcodegen->config->bottom_solid_layers);
+        && ($layer->id > 0 || $self->print->config->brim_width == 0)
+        && ($layer->id >= $self->print->config->skirt_height && $self->print->config->skirt_height != -1)
+        && !defined(first { $_->config->bottom_solid_layers > $layer->id } @{$layer->regions});
     
     # if we're going to apply spiralvase to this layer, disable loop clipping
     $self->gcodegen->enable_loop_clipping(!$spiralvase);
     
     if (!$self->second_layer_things_done && $layer->id == 1) {
-        for my $t (grep $self->extruders->[$_], 0 .. $#{$self->gcodegen->config->temperature}) {
+        for my $t (grep $self->extruders->[$_], 0 .. $#{$self->print->config->temperature}) {
             $gcode .= $self->gcodegen->set_temperature($self->extruders->[$t]->temperature, 0, $t)
                 if $self->print->extruders->[$t]->temperature && $self->extruders->[$t]->temperature != $self->extruders->[$t]->first_layer_temperature;
         }
-        $gcode .= $self->gcodegen->set_bed_temperature($self->gcodegen->config->bed_temperature)
-            if $self->gcodegen->config->bed_temperature && $self->gcodegen->config->bed_temperature != $self->gcodegen->config->first_layer_bed_temperature;
+        $gcode .= $self->gcodegen->set_bed_temperature($self->print->config->bed_temperature)
+            if $self->print->config->bed_temperature && $self->print->config->bed_temperature != $self->print->config->first_layer_bed_temperature;
         $self->second_layer_things_done(1);
     }
     
     # set new layer - this will change Z and force a retraction if retract_layer_change is enabled
     $gcode .= $self->gcodegen->change_layer($layer);
-    $gcode .= $self->gcodegen->replace_variables($self->gcodegen->config->layer_gcode, {
+    $gcode .= $self->gcodegen->replace_variables($self->print->config->layer_gcode, {
         layer_num => $self->gcodegen->layer->id,
-    }) . "\n" if $self->gcodegen->config->layer_gcode;
+    }) . "\n" if $self->print->config->layer_gcode;
     
     # extrude skirt
-    if (((values %{$self->skirt_done}) < $self->gcodegen->config->skirt_height || $self->gcodegen->config->skirt_height == -1)
+    if (((values %{$self->skirt_done}) < $self->print->config->skirt_height || $self->print->config->skirt_height == -1)
         && !$self->skirt_done->{$layer->print_z}) {
         $self->gcodegen->set_shift(@{$self->shift});
         $gcode .= $self->gcodegen->set_extruder($self->extruders->[0]);
         # skip skirt if we have a large brim
-        if ($layer->id < $self->gcodegen->config->skirt_height || $self->gcodegen->config->skirt_height == -1) {
+        if ($layer->id < $self->print->config->skirt_height || $self->print->config->skirt_height == -1) {
             # distribute skirt loops across all extruders
             my @skirt_loops = @{$self->print->skirt};
             for my $i (0 .. $#skirt_loops) {
                 # when printing layers > 0 ignore 'min_skirt_length' and 
                 # just use the 'skirts' setting; also just use the current extruder
-                last if ($layer->id > 0) && ($i >= $self->gcodegen->config->skirts);
+                last if ($layer->id > 0) && ($i >= $self->print->config->skirts);
                 $gcode .= $self->gcodegen->set_extruder($self->extruders->[ ($i/@{$self->extruders}) % @{$self->extruders} ])
                     if $layer->id == 0;
                 $gcode .= $self->gcodegen->extrude_loop($skirt_loops[$i], 'skirt');
@@ -94,7 +96,7 @@ sub process_layer {
     
     # extrude brim
     if (!$self->brim_done) {
-        $gcode .= $self->gcodegen->set_extruder($self->extruders->[$self->gcodegen->config->support_material_extruder-1]);
+        $gcode .= $self->gcodegen->set_extruder($self->extruders->[$self->print->objects->[0]->config->support_material_extruder-1]);
         $self->gcodegen->set_shift(@{$self->shift});
         $gcode .= $self->gcodegen->extrude_loop($_, 'brim') for @{$self->print->brim};
         $self->brim_done(1);
@@ -109,15 +111,17 @@ sub process_layer {
         
         # extrude support material before other things because it might use a lower Z
         # and also because we avoid travelling on other things when printing it
-        if ($self->print->has_support_material && $layer->isa('Slic3r::Layer::Support')) {
+        if ($layer->isa('Slic3r::Layer::Support')) {
             if ($layer->support_interface_fills->count > 0) {
-                $gcode .= $self->gcodegen->set_extruder($self->extruders->[$self->gcodegen->config->support_material_interface_extruder-1]);
-                $gcode .= $self->gcodegen->extrude_path($_, 'support material interface') 
+                $gcode .= $self->gcodegen->set_extruder($self->extruders->[$object->config->support_material_interface_extruder-1]);
+                my %params = (speed => $object->config->support_material_speed*60);
+                $gcode .= $self->gcodegen->extrude_path($_, 'support material interface', %params) 
                     for @{$layer->support_interface_fills->chained_path_from($self->gcodegen->last_pos, 0)}; 
             }
             if ($layer->support_fills->count > 0) {
-                $gcode .= $self->gcodegen->set_extruder($self->extruders->[$self->gcodegen->config->support_material_extruder-1]);
-                $gcode .= $self->gcodegen->extrude_path($_, 'support material') 
+                $gcode .= $self->gcodegen->set_extruder($self->extruders->[$object->config->support_material_extruder-1]);
+                my %params = (speed => $object->config->support_material_speed*60);
+                $gcode .= $self->gcodegen->extrude_path($_, 'support material', %params) 
                     for @{$layer->support_fills->chained_path_from($self->gcodegen->last_pos, 0)};
             }
         }
@@ -126,16 +130,17 @@ sub process_layer {
         my @region_ids = 0 .. ($self->print->regions_count-1);
         if ($self->gcodegen->multiple_extruders) {
             my $last_extruder = $self->gcodegen->extruder;
-            my $best_region_id = first { $self->print->regions->[$_]->extruders->{perimeter} eq $last_extruder } @region_ids;
+            my $best_region_id = first { $self->print->regions->[$_]->config->perimeter_extruder-1 eq $last_extruder } @region_ids;
             @region_ids = ($best_region_id, grep $_ != $best_region_id, @region_ids) if $best_region_id;
         }
         
         foreach my $region_id (@region_ids) {
             my $layerm = $layer->regions->[$region_id] or next;
             my $region = $self->print->regions->[$region_id];
+            $self->gcodegen->region($region);
             
             my @islands = ();
-            if ($self->gcodegen->config->avoid_crossing_perimeters) {
+            if ($self->print->config->avoid_crossing_perimeters) {
                 push @islands, { perimeters => [], fills => [] }
                     for 1 .. (@{$layer->slices} || 1);  # make sure we have at least one island hash to avoid failure of the -1 subscript below
                 PERIMETER: foreach my $perimeter (@{$layerm->perimeters}) {
@@ -166,8 +171,8 @@ sub process_layer {
             foreach my $island (@islands) {
                 # give priority to infill if we were already using its extruder and it wouldn't
                 # be good for perimeters
-                if ($self->gcodegen->config->infill_first
-                    || ($self->gcodegen->multiple_extruders && $region->extruders->{infill} eq $self->gcodegen->extruder) && $region->extruders->{infill} ne $region->extruders->{perimeter}) {
+                if ($self->print->config->infill_first
+                    || ($self->gcodegen->multiple_extruders && $region->config->infill_extruder-1 == $self->gcodegen->extruder->id && $region->config->infill_extruder != $region->config->perimeter_extruder)) {
                     $gcode .= $self->_extrude_infill($island, $region);
                     $gcode .= $self->_extrude_perimeters($island, $region);
                 } else {
@@ -184,11 +189,11 @@ sub process_layer {
     
     # apply vibration limit if enabled
     $gcode = $self->vibration_limit->process($gcode)
-        if $self->gcodegen->config->vibration_limit != 0;
+        if $self->print->config->vibration_limit != 0;
     
     # apply arc fitting if enabled
     $gcode = $self->arc_fitting->process($gcode)
-        if $self->gcodegen->config->gcode_arcs;
+        if $self->print->config->gcode_arcs;
     
     return $gcode;
 }
@@ -200,7 +205,7 @@ sub _extrude_perimeters {
     return "" if !@{ $island->{perimeters} };
     
     my $gcode = "";
-    $gcode .= $self->gcodegen->set_extruder($region->extruders->{perimeter});
+    $gcode .= $self->gcodegen->set_extruder($self->extruders->[$region->config->perimeter_extruder-1]);
     $gcode .= $self->gcodegen->extrude($_, 'perimeter') for @{ $island->{perimeters} };
     return $gcode;
 }
@@ -212,7 +217,7 @@ sub _extrude_infill {
     return "" if !@{ $island->{fills} };
     
     my $gcode = "";
-    $gcode .= $self->gcodegen->set_extruder($region->extruders->{infill});
+    $gcode .= $self->gcodegen->set_extruder($self->extruders->[$region->config->infill_extruder-1]);
     for my $fill (@{ $island->{fills} }) {
         if ($fill->isa('Slic3r::ExtrusionPath::Collection')) {
             $gcode .= $self->gcodegen->extrude($_, 'fill') 
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index d490597d..d44a06b6 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -12,9 +12,9 @@ use Slic3r::Geometry::Clipper qw(diff_ex union_ex union_pt intersection_ex inter
     offset2 union union_pt_chained JT_ROUND JT_SQUARE);
 use Slic3r::Print::State ':steps';
 
-has 'config'                 => (is => 'rw', default => sub { Slic3r::Config::Print->new }, trigger => \&init_config);
-has 'default_object_config'  => (is => 'rw', default => sub { Slic3r::Config::PrintObject->new });
-has 'default_region_config'  => (is => 'rw', default => sub { Slic3r::Config::PrintRegion->new });
+has 'config'                 => (is => 'ro', default => sub { Slic3r::Config::Print->new });
+has 'default_object_config'  => (is => 'ro', default => sub { Slic3r::Config::PrintObject->new });
+has 'default_region_config'  => (is => 'ro', default => sub { Slic3r::Config::PrintRegion->new });
 has 'extra_variables'        => (is => 'rw', default => sub {{}});
 has 'objects'                => (is => 'rw', default => sub {[]});
 has 'status_cb'              => (is => 'rw');
@@ -28,52 +28,12 @@ has 'skirt' => (is => 'rw', default => sub { Slic3r::ExtrusionPath::Collection->
 # ordered collection of extrusion paths to build a brim
 has 'brim' => (is => 'rw', default => sub { Slic3r::ExtrusionPath::Collection->new });
 
-sub BUILD {
-    my $self = shift;
-    
-    # call this manually because the 'default' coderef doesn't trigger the trigger
-    $self->init_config;
-}
-
-# this method needs to be idempotent
-sub init_config {
-    my $self = shift;
-    
-    # legacy with existing config files
-    $self->config->set('first_layer_height', $self->config->layer_height)
-        if !$self->config->first_layer_height;
-    $self->config->set_ifndef('small_perimeter_speed',  $self->config->perimeter_speed);
-    $self->config->set_ifndef('bridge_speed',           $self->config->infill_speed);
-    $self->config->set_ifndef('solid_infill_speed',     $self->config->infill_speed);
-    $self->config->set_ifndef('top_solid_infill_speed', $self->config->solid_infill_speed);
-    $self->config->set_ifndef('top_solid_layers',       $self->config->solid_layers);
-    $self->config->set_ifndef('bottom_solid_layers',    $self->config->solid_layers);
-    
-    # G-code flavors
-    $self->config->set('extrusion_axis', 'A') if $self->config->gcode_flavor eq 'mach3';
-    $self->config->set('extrusion_axis', '')  if $self->config->gcode_flavor eq 'no-extrusion';
-    
-    # enforce some settings when spiral_vase is set
-    if ($self->config->spiral_vase) {
-        $self->config->set('perimeters', 1);
-        $self->config->set('fill_density', 0);
-        $self->config->set('top_solid_layers', 0);
-        $self->config->set('support_material', 0);
-        $self->config->set('support_material_enforce_layers', 0);
-        $self->config->set('retract_layer_change', [0]);  # TODO: only apply this to the spiral layers
-    }
-    
-    # force all retraction lift values to be the same
-    $self->config->set('retract_lift', [ map $self->config->retract_lift->[0], @{$self->config->retract_lift} ]);
-}
-
 sub apply_config {
     my ($self, $config) = @_;
     
     $self->config->apply_dynamic($config);
     $self->default_object_config->apply_dynamic($config);
     $self->default_region_config->apply_dynamic($config);
-    $self->init_config;
 }
 
 sub has_support_material {
@@ -261,11 +221,21 @@ sub init_extruders {
     }
     
     for my $extruder_id (keys %{{ map {$_ => 1} @used_extruders }}) {
+        # make sure print config contains a value for all extruders
+        my %extruder_config = ();
+        foreach my $opt_key (@{&Slic3r::Extruder::OPTIONS}) {
+            my $value = $self->config->get($opt_key);
+            if (!defined $value->[$extruder_id]) {
+                $value->[$extruder_id] = $value->[0];
+                $self->config->set($opt_key, $value);
+            }
+            $extruder_config{$opt_key} = $value->[$extruder_id];
+        }
+        
         $self->extruders->[$extruder_id] = Slic3r::Extruder->new(
-            config => $self->config,
             id => $extruder_id,
-            map { $_ => $self->config->get($_)->[$extruder_id] // $self->config->get($_)->[0] } #/
-                @{&Slic3r::Extruder::OPTIONS}
+            use_relative_e_distances => $self->config->use_relative_e_distances,
+            %extruder_config,
         );
     }
     
@@ -614,16 +584,17 @@ sub make_skirt {
     # skirt may be printed on several layers, having distinct layer heights,
     # but loops must be aligned so can't vary width/spacing
     # TODO: use each extruder's own flow
+    my $region0_config = $self->regions->[0]->config;
+    my $first_layer_height = $self->objects->[0]->config->get_value('first_layer_height');
     my $flow = Slic3r::Flow->new(
-        width               => ($self->config->first_layer_extrusion_width || $self->config->perimeter_extrusion_width),
+        width               => ($region0_config->first_layer_extrusion_width || $region0_config->perimeter_extrusion_width),
         role                => FLOW_ROLE_PERIMETER,
         nozzle_diameter     => $self->config->nozzle_diameter->[0],
-        layer_height        => $self->config->get_abs_value('first_layer_height'),
+        layer_height        => $first_layer_height,
         bridge_flow_ratio   => 0,
     );
     my $spacing = $flow->spacing;
     
-    my $first_layer_height = $self->config->get_value('first_layer_height');
     my @extruders_e_per_mm = ();
     my $extruder_idx = 0;
     
@@ -664,10 +635,10 @@ sub make_brim {
     
     # brim is only printed on first layer and uses support material extruder
     my $flow = Slic3r::Flow->new(
-        width               => ($self->config->first_layer_extrusion_width || $self->config->perimeter_extrusion_width),
+        width               => ($self->regions->[0]->config->first_layer_extrusion_width || $self->regions->[0]->config->perimeter_extrusion_width),
         role                => FLOW_ROLE_PERIMETER,
-        nozzle_diameter     => $self->config->nozzle_diameter->[ $self->config->support_material_extruder-1 ],
-        layer_height        => $self->config->get_abs_value('first_layer_height'),
+        nozzle_diameter     => $self->config->nozzle_diameter->[ $self->objects->[0]->config->support_material_extruder-1 ],
+        layer_height        => $self->objects->[0]->config->get_abs_value('first_layer_height'),
         bridge_flow_ratio   => 0,
     );
     
@@ -737,34 +708,28 @@ sub write_gcode {
     print $fh "; $_\n" foreach split /\R/, $self->config->notes;
     print $fh "\n" if $self->config->notes;
     
-    for (qw(layer_height perimeters top_solid_layers bottom_solid_layers fill_density perimeter_speed infill_speed travel_speed)) {
-        printf $fh "; %s = %s\n", $_, $self->config->$_;
-    }
-    for (qw(nozzle_diameter filament_diameter extrusion_multiplier)) {
-        printf $fh "; %s = %s\n", $_, $self->config->$_->[0];
-    }
-    
+    my $layer_height = $self->objects->[0]->config->layer_height;
     for my $region_id (0..$#{$self->regions}) {
         printf $fh "; perimeters extrusion width = %.2fmm\n",
-            $self->regions->[$region_id]->flow(FLOW_ROLE_PERIMETER)->width;
+            $self->regions->[$region_id]->flow(FLOW_ROLE_PERIMETER, $layer_height)->width;
         printf $fh "; infill extrusion width = %.2fmm\n",
-            $self->regions->[$region_id]->flow(FLOW_ROLE_INFILL)->width;
+            $self->regions->[$region_id]->flow(FLOW_ROLE_INFILL, $layer_height)->width;
         printf $fh "; solid infill extrusion width = %.2fmm\n",
-            $self->regions->[$region_id]->flow(FLOW_ROLE_SOLID_INFILL)->width;
+            $self->regions->[$region_id]->flow(FLOW_ROLE_SOLID_INFILL, $layer_height)->width;
         printf $fh "; top infill extrusion width = %.2fmm\n",
-            $self->regions->[$region_id]->flow(FLOW_ROLE_TOP_SOLID_INFILL)->width;
+            $self->regions->[$region_id]->flow(FLOW_ROLE_TOP_SOLID_INFILL, $layer_height)->width;
         printf $fh "; support material extrusion width = %.2fmm\n",
             $self->objects->[0]->support_material_flow->width
             if $self->has_support_material;
         printf $fh "; first layer extrusion width = %.2fmm\n",
-            $self->regions->[$region_id]->flow(FLOW_ROLE_PERIMETER, 0, 1)->width
-            if ($self->regions->[$region_id]->config->first_layer_extrusion_width != 0);
+            $self->regions->[$region_id]->flow(FLOW_ROLE_PERIMETER, $layer_height, 0, 1)->width
+            if ($self->regions->[$region_id]->config->first_layer_extrusion_width ne '0');
         print  $fh "\n";
     }
     
     # set up our extruder object
     my $gcodegen = Slic3r::GCode->new(
-        config              => $self->config,
+        print_config        => $self->config,
         extra_variables     => $self->extra_variables,
         extruders           => $self->extruders,    # we should only pass the *used* extruders (but maintain the Tx indices right!)
         layer_count         => $self->layer_count,
@@ -941,13 +906,11 @@ sub write_gcode {
             $extruder->absolute_E, $extruder->extruded_volume/1000;
     }
     
-    if ($self->config->gcode_comments) {
-        # append full config
-        print $fh "\n";
-        foreach my $opt_key (sort @{$self->config->get_keys}) {
-            next if $Slic3r::Config::Options->{$opt_key}{shortcut};
-            printf $fh "; %s = %s\n", $opt_key, $self->config->serialize($opt_key);
-        }
+    # append full config
+    print $fh "\n";
+    foreach my $opt_key (sort @{$self->config->get_keys}) {
+        next if $Slic3r::Config::Options->{$opt_key}{shortcut};
+        printf $fh "; %s = %s\n", $opt_key, $self->config->serialize($opt_key);
     }
     
     # close our gcode file
diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 600a0dcc..bf4c2efb 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -521,13 +521,16 @@ sub clip_fill_surfaces {
 
 sub bridge_over_infill {
     my $self = shift;
-    return if $self->config->fill_density == 1;
     
-    for my $layer_id (1..$#{$self->layers}) {
-        my $layer       = $self->layers->[$layer_id];
-        my $lower_layer = $self->layers->[$layer_id-1];
+    for my $region_id (0..$#{$self->print->regions}) {
+        my $fill_density = $self->print->regions->[$region_id]->config->fill_density;
+        next if $fill_density == 1 || $fill_density == 0;
         
-        foreach my $layerm (@{$layer->regions}) {
+        for my $layer_id (1..$#{$self->layers}) {
+            my $layer       = $self->layers->[$layer_id];
+            my $layerm      = $layer->regions->[$region_id];
+            my $lower_layer = $self->layers->[$layer_id-1];
+            
             # compute the areas needing bridge math 
             my @internal_solid = @{$layerm->fill_surfaces->filter_by_type(S_TYPE_INTERNALSOLID)};
             my @lower_internal = map @{$_->fill_surfaces->filter_by_type(S_TYPE_INTERNAL)}, @{$lower_layer->regions};
@@ -861,7 +864,8 @@ sub generate_support_material {
         && $self->layer_count >= 2;
     
     my $s = Slic3r::Print::SupportMaterial->new(
-        config          => $self->config,
+        print_config    => $self->print->config,
+        object_config   => $self->config,
         flow            => $self->support_material_flow,
         interface_flow  => $self->support_material_flow(FLOW_ROLE_SUPPORT_MATERIAL_INTERFACE),
     );
diff --git a/lib/Slic3r/Print/Region.pm b/lib/Slic3r/Print/Region.pm
index 4cb929e0..ff05d5bc 100644
--- a/lib/Slic3r/Print/Region.pm
+++ b/lib/Slic3r/Print/Region.pm
@@ -53,7 +53,7 @@ sub flow {
         role                => $role,
         nozzle_diameter     => $nozzle_diameter,
         layer_height        => $layer_height,
-        bridge_flow_ratio   => ($bridge ? $self->config->bridge_flow_ratio : 0),
+        bridge_flow_ratio   => ($bridge ? $self->print->config->bridge_flow_ratio : 0),
     );
 }
 
diff --git a/lib/Slic3r/Print/SupportMaterial.pm b/lib/Slic3r/Print/SupportMaterial.pm
index 291268bb..38949d22 100644
--- a/lib/Slic3r/Print/SupportMaterial.pm
+++ b/lib/Slic3r/Print/SupportMaterial.pm
@@ -3,13 +3,15 @@ use Moo;
 
 use List::Util qw(sum min max);
 use Slic3r::ExtrusionPath ':roles';
+use Slic3r::Flow ':roles';
 use Slic3r::Geometry qw(scale scaled_epsilon PI rad2deg deg2rad);
 use Slic3r::Geometry::Clipper qw(offset diff union union_ex intersection offset_ex offset2
     intersection_pl);
 use Slic3r::Surface ':types';
 
-has 'config' => (is => 'rw', required => 1);
-has 'flow'   => (is => 'rw', required => 1);
+has 'print_config'  => (is => 'rw', required => 1);
+has 'object_config' => (is => 'rw', required => 1);
+has 'flow'          => (is => 'rw', required => 1);
 
 use constant DEBUG_CONTACT_ONLY => 0;
 
@@ -73,8 +75,8 @@ sub contact_area {
     
     # if user specified a custom angle threshold, convert it to radians
     my $threshold_rad;
-    if ($self->config->support_material_threshold) {
-        $threshold_rad = deg2rad($self->config->support_material_threshold + 1);  # +1 makes the threshold inclusive
+    if ($self->object_config->support_material_threshold) {
+        $threshold_rad = deg2rad($self->object_config->support_material_threshold + 1);  # +1 makes the threshold inclusive
         Slic3r::debugf "Threshold angle = %d°\n", rad2deg($threshold_rad);
     }
     
@@ -86,9 +88,9 @@ sub contact_area {
         # so $layer_id == 0 means first object layer
         # and $layer->id == 0 means first print layer (including raft)
         
-        if ($self->config->raft_layers == 0) {
+        if ($self->object_config->raft_layers == 0) {
             next if $layer_id == 0;
-        } elsif (!$self->config->support_material) {
+        } elsif (!$self->object_config->support_material) {
             # if we are only going to generate raft just check 
             # the 'overhangs' of the first object layer
             last if $layer_id > 0;
@@ -110,8 +112,8 @@ sub contact_area {
             
                 # If a threshold angle was specified, use a different logic for detecting overhangs.
                 if (defined $threshold_rad
-                    || $layer_id < $self->config->support_material_enforce_layers
-                    || $self->config->raft_layers > 0) {
+                    || $layer_id < $self->object_config->support_material_enforce_layers
+                    || $self->object_config->raft_layers > 0) {
                     my $d = defined $threshold_rad
                         ? scale $lower_layer->height * ((cos $threshold_rad) / (sin $threshold_rad))
                         : 0;
@@ -170,8 +172,8 @@ sub contact_area {
         # now apply the contact areas to the layer were they need to be made
         {
             # get the average nozzle diameter used on this layer
-            my @nozzle_diameters = map $_->nozzle_diameter,
-                map { $_->perimeter_flow, $_->solid_infill_flow }
+            my @nozzle_diameters = map $self->print_config->nozzle_diameter->[$_],
+                map { $_->config->perimeter_extruder-1, $_->config->infill_extruder-1 }
                 @{$layer->regions};
             my $nozzle_diameter = sum(@nozzle_diameters)/@nozzle_diameters;
             
@@ -179,7 +181,7 @@ sub contact_area {
             ###$contact_z = $layer->print_z - $layer->height;
             
             # ignore this contact area if it's too low
-            next if $contact_z < $self->config->get_value('first_layer_height');
+            next if $contact_z < $self->object_config->get_value('first_layer_height');
             
             $contact{$contact_z}  = [ @contact ];
             $overhang{$contact_z} = [ @overhang ];
@@ -242,25 +244,25 @@ sub support_layers_z {
     # determine layer height for any non-contact layer
     # we use max() to prevent many ultra-thin layers to be inserted in case
     # layer_height > nozzle_diameter * 0.75
-    my $nozzle_diameter = $self->flow->nozzle_diameter;
+    my $nozzle_diameter = $self->print_config->nozzle_diameter->[$self->object_config->support_material_extruder-1];
     my $support_material_height = max($max_object_layer_height, $nozzle_diameter * 0.75);
     
     my @z = sort { $a <=> $b } @$contact_z, @$top_z, (map $_ + $nozzle_diameter, @$top_z);
     
     # enforce first layer height
-    my $first_layer_height = $self->config->get_value('first_layer_height');
+    my $first_layer_height = $self->object_config->get_value('first_layer_height');
     shift @z while @z && $z[0] <= $first_layer_height;
     unshift @z, $first_layer_height;
     
     # add raft layers by dividing the space between first layer and
     # first contact layer evenly
-    if ($self->config->raft_layers > 1 && @z >= 2) {
+    if ($self->object_config->raft_layers > 1 && @z >= 2) {
         # $z[1] is last raft layer (contact layer for the first layer object)
-        my $height = ($z[1] - $z[0]) / ($self->config->raft_layers - 1);
+        my $height = ($z[1] - $z[0]) / ($self->object_config->raft_layers - 1);
         splice @z, 1, 0,
             map { int($_*100)/100 }
             map { $z[0] + $height * $_ }
-            0..($self->config->raft_layers - 1);
+            0..($self->object_config->raft_layers - 1);
     }
     
     for (my $i = $#z; $i >= 0; $i--) {
@@ -291,7 +293,7 @@ sub generate_interface_layers {
     
     # let's now generate interface layers below contact areas
     my %interface = ();  # layer_id => [ polygons ]
-    my $interface_layers = $self->config->support_material_interface_layers;
+    my $interface_layers = $self->object_config->support_material_interface_layers;
     for my $layer_id (0 .. $#$support_z) {
         my $z = $support_z->[$layer_id];
         my $this = $contact->{$z} // next;
@@ -339,7 +341,7 @@ sub generate_base_layers {
             # in case we have no interface layers, look at upper contact
             # (1 interface layer means we only have contact layer, so $interface->{$i+1} is empty)
             my @upper_contact = ();
-            if ($self->config->support_material_interface_layers <= 1) {
+            if ($self->object_config->support_material_interface_layers <= 1) {
                 @upper_contact = @{ $contact->{$support_z->[$i+1]} || [] };
             }
             
@@ -395,8 +397,8 @@ sub generate_toolpaths {
     Slic3r::debugf "Generating patterns\n";
     
     # prepare fillers
-    my $pattern = $self->config->support_material_pattern;
-    my @angles = ($self->config->support_material_angle);
+    my $pattern = $self->object_config->support_material_pattern;
+    my @angles = ($self->object_config->support_material_angle);
     if ($pattern eq 'rectilinear-grid') {
         $pattern = 'rectilinear';
         push @angles, $angles[0] + 90;
@@ -407,10 +409,10 @@ sub generate_toolpaths {
         support     => $object->fill_maker->filler($pattern),
     );
     
-    my $interface_angle = $self->config->support_material_angle + 90;
-    my $interface_spacing = $self->config->support_material_interface_spacing + $flow->spacing;
+    my $interface_angle = $self->object_config->support_material_angle + 90;
+    my $interface_spacing = $self->object_config->support_material_interface_spacing + $flow->spacing;
     my $interface_density = $interface_spacing == 0 ? 1 : $flow->spacing / $interface_spacing;
-    my $support_spacing = $self->config->support_material_spacing + $flow->spacing;
+    my $support_spacing = $self->object_config->support_material_spacing + $flow->spacing;
     my $support_density = $support_spacing == 0 ? 1 : $flow->spacing / $support_spacing;
     
     my $process_layer = sub {
@@ -441,7 +443,7 @@ sub generate_toolpaths {
         
         # contact
         my $contact_infill = [];
-        if ($self->config->support_material_interface_layers == 0) {
+        if ($self->object_config->support_material_interface_layers == 0) {
             # if no interface layers were requested we treat the contact layer
             # exactly as a generic base layer
             push @$base, @$contact;
@@ -561,7 +563,7 @@ sub generate_toolpaths {
             # base flange
             if ($layer_id == 0) {
                 $filler = $fillers{interface};
-                $filler->angle($self->config->support_material_angle + 90);
+                $filler->angle($self->object_config->support_material_angle + 90);
                 $density        = 0.5;
                 $flow_spacing   = $object->print->first_layer_support_material_flow->spacing;
             } else {
@@ -609,7 +611,7 @@ sub generate_toolpaths {
     };
     
     Slic3r::parallelize(
-        threads => $self->config->threads,
+        threads => $self->print_config->threads,
         items => [ 0 .. $#{$object->support_layers} ],
         thread_cb => sub {
             my $q = shift;
diff --git a/lib/Slic3r/Test.pm b/lib/Slic3r/Test.pm
index 3a394431..2e88268a 100644
--- a/lib/Slic3r/Test.pm
+++ b/lib/Slic3r/Test.pm
@@ -99,20 +99,21 @@ sub model {
 sub init_print {
     my ($model_name, %params) = @_;
     
-    my $config = Slic3r::Config->new_from_defaults;
+    my $config = Slic3r::Config->new;
     $config->apply($params{config}) if $params{config};
     $config->set('gcode_comments', 1) if $ENV{SLIC3R_TESTS_GCODE};
     
-    my $print = Slic3r::Print->new(config => $config);
+    my $print = Slic3r::Print->new;
+    $print->apply_config($config);
     
     $model_name = [$model_name] if ref($model_name) ne 'ARRAY';
     for my $model (map model($_, %params), @$model_name) {
         die "Unknown model in test" if !defined $model;
         if (defined $params{duplicate} && $params{duplicate} > 1) {
-            $model->duplicate($params{duplicate} // 1, $config->min_object_distance);
+            $model->duplicate($params{duplicate} // 1, $print->config->min_object_distance);
         }
-        $model->arrange_objects($config->min_object_distance);
-        $model->center_instances_around_point($config->print_center);
+        $model->arrange_objects($print->config->min_object_distance);
+        $model->center_instances_around_point($print->config->print_center);
         $print->add_model_object($_) for @{$model->objects};
     }
     $print->validate;
diff --git a/slic3r.pl b/slic3r.pl
index 0be1219d..beea8037 100755
--- a/slic3r.pl
+++ b/slic3r.pl
@@ -153,12 +153,12 @@ if (@ARGV) {  # slicing from command line
         }
         
         my $print = Slic3r::Print->new(
-            config      => $config,
             status_cb   => sub {
                 my ($percent, $message) = @_;
                 printf "=> %s\n", $message;
             },
         );
+        $print->apply_config($config);
         foreach my $model_object (@{$model->objects}) {
             $print->auto_assign_extruders($model_object);
             $print->add_model_object($model_object);
diff --git a/t/cooling.t b/t/cooling.t
index 87d3dff3..6fc5cf71 100644
--- a/t/cooling.t
+++ b/t/cooling.t
@@ -13,10 +13,14 @@ use Slic3r;
 use Slic3r::Test;
 
 sub buffer {
-    my $config = shift || Slic3r::Config->new_from_defaults;
+    my $config = shift || Slic3r::Config->new;
+    
+    my $print_config = Slic3r::Config::Print->new;
+    $print_config->apply_dynamic($config);
+    
     my $buffer = Slic3r::GCode::CoolingBuffer->new(
-        config      => $config,
-        gcodegen    => Slic3r::GCode->new(config => $config, layer_count => 10, extruders => []),
+        config      => $print_config,
+        gcodegen    => Slic3r::GCode->new(print_config => $print_config, layer_count => 10, extruders => []),
     );
     return $buffer;
 }
diff --git a/t/gcode.t b/t/gcode.t
index c8db2f81..bd5677fc 100644
--- a/t/gcode.t
+++ b/t/gcode.t
@@ -14,9 +14,8 @@ use Slic3r::Test;
 
 {
     my $gcodegen = Slic3r::GCode->new(
-        config      => Slic3r::Config->new_from_defaults,
-        layer_count => 1,
-        extruders   => [],
+        layer_count     => 1,
+        extruders       => [],
     );
     $gcodegen->set_shift(10, 10);
     is_deeply $gcodegen->last_pos->arrayref, [scale -10, scale -10], 'last_pos is shifted correctly';
diff --git a/t/shells.t b/t/shells.t
index 10da9055..541c7cb7 100644
--- a/t/shells.t
+++ b/t/shells.t
@@ -140,6 +140,9 @@ use Slic3r::Test;
 
 {
     my $config = Slic3r::Config->new_from_defaults;
+    $config->set('perimeters', 1);
+    $config->set('fill_density', 0);
+    $config->set('top_solid_layers', 0);
     $config->set('spiral_vase', 1);
     $config->set('bottom_solid_layers', 0);
     $config->set('skirts', 0);
diff --git a/t/support.t b/t/support.t
index b7d1810d..bd82d0ce 100644
--- a/t/support.t
+++ b/t/support.t
@@ -21,16 +21,16 @@ use Slic3r::Test;
     my $test = sub {
         my $print = Slic3r::Test::init_print('20mm_cube', config => $config);
         $print->init_extruders;
-        my $flow = $print->support_material_flow;
+        my $flow = $print->objects->[0]->support_material_flow;
         my $support_z = Slic3r::Print::SupportMaterial
-            ->new(config => $config, flow => $flow)
+            ->new(object_config => $print->objects->[0]->config, print_config => $print->config, flow => $flow)
             ->support_layers_z(\@contact_z, \@top_z, $config->layer_height);
         
         is $support_z->[0], $config->first_layer_height,
             'first layer height is honored';
         is scalar(grep { $support_z->[$_]-$support_z->[$_-1] <= 0 } 1..$#$support_z), 0,
             'no null or negative support layers';
-        is scalar(grep { $support_z->[$_]-$support_z->[$_-1] > $flow->nozzle_diameter + epsilon } 1..$#$support_z), 0,
+        is scalar(grep { $support_z->[$_]-$support_z->[$_-1] > $config->nozzle_diameter->[0] + epsilon } 1..$#$support_z), 0,
             'no layers thicker than nozzle diameter';
         
         my $wrong_top_spacing = 0;
@@ -40,7 +40,7 @@ use Slic3r::Test;
             
             # check that first support layer above this top surface is spaced with nozzle diameter
             $wrong_top_spacing = 1
-                if ($support_z->[$layer_id+1] - $support_z->[$layer_id]) != $flow->nozzle_diameter;
+                if ($support_z->[$layer_id+1] - $support_z->[$layer_id]) != $config->nozzle_diameter->[0];
         }
         ok !$wrong_top_spacing, 'layers above top surfaces are spaced correctly';
     };
diff --git a/xs/src/PrintConfig.hpp b/xs/src/PrintConfig.hpp
index 4643c8b7..cecd00a3 100644
--- a/xs/src/PrintConfig.hpp
+++ b/xs/src/PrintConfig.hpp
@@ -899,6 +899,7 @@ class PrintObjectConfig : public virtual StaticConfig
     public:
     ConfigOptionFloatOrPercent      extrusion_width;
     ConfigOptionFloatOrPercent      first_layer_height;
+    ConfigOptionBool                infill_only_where_needed;
     ConfigOptionFloat               layer_height;
     ConfigOptionInt                 raft_layers;
     ConfigOptionBool                support_material;
@@ -921,6 +922,7 @@ class PrintObjectConfig : public virtual StaticConfig
         this->extrusion_width.percent                            = false;
         this->first_layer_height.value                           = 0.35;
         this->first_layer_height.percent                         = false;
+        this->infill_only_where_needed.value                     = false;
         this->layer_height.value                                 = 0.4;
         this->raft_layers.value                                  = 0;
         this->support_material.value                             = false;
@@ -941,6 +943,7 @@ class PrintObjectConfig : public virtual StaticConfig
     ConfigOption* option(const t_config_option_key opt_key, bool create = false) {
         if (opt_key == "extrusion_width")                            return &this->extrusion_width;
         if (opt_key == "first_layer_height")                         return &this->first_layer_height;
+        if (opt_key == "infill_only_where_needed")                   return &this->infill_only_where_needed;
         if (opt_key == "layer_height")                               return &this->layer_height;
         if (opt_key == "raft_layers")                                return &this->raft_layers;
         if (opt_key == "support_material")                           return &this->support_material;
@@ -972,7 +975,6 @@ class PrintRegionConfig : public virtual StaticConfig
     ConfigOptionInt                 infill_extruder;
     ConfigOptionFloatOrPercent      infill_extrusion_width;
     ConfigOptionInt                 infill_every_layers;
-    ConfigOptionBool                infill_only_where_needed;
     ConfigOptionInt                 perimeter_extruder;
     ConfigOptionFloatOrPercent      perimeter_extrusion_width;
     ConfigOptionInt                 perimeters;
@@ -999,7 +1001,6 @@ class PrintRegionConfig : public virtual StaticConfig
         this->infill_extrusion_width.value                       = 0;
         this->infill_extrusion_width.percent                     = false;
         this->infill_every_layers.value                          = 1;
-        this->infill_only_where_needed.value                     = false;
         this->perimeter_extruder.value                           = 1;
         this->perimeter_extrusion_width.value                    = 0;
         this->perimeter_extrusion_width.percent                  = false;
@@ -1025,7 +1026,6 @@ class PrintRegionConfig : public virtual StaticConfig
         if (opt_key == "infill_extruder")                            return &this->infill_extruder;
         if (opt_key == "infill_extrusion_width")                     return &this->infill_extrusion_width;
         if (opt_key == "infill_every_layers")                        return &this->infill_every_layers;
-        if (opt_key == "infill_only_where_needed")                   return &this->infill_only_where_needed;
         if (opt_key == "perimeter_extruder")                         return &this->perimeter_extruder;
         if (opt_key == "perimeter_extrusion_width")                  return &this->perimeter_extrusion_width;
         if (opt_key == "perimeters")                                 return &this->perimeters;
@@ -1332,6 +1332,15 @@ class PrintConfig : public virtual StaticConfig
         
         return NULL;
     };
+    
+    std::string get_extrusion_axis() {
+        if (this->gcode_flavor == gcfMach3) {
+            return std::string("A");
+        } else if (this->gcode_flavor == gcfNoExtrusion) {
+            return std::string("");
+        }
+        return this->extrusion_axis;
+    }
 };
 
 class DynamicPrintConfig : public DynamicConfig
diff --git a/xs/xsp/Config.xsp b/xs/xsp/Config.xsp
index 5c3966e1..b7f6f3ec 100644
--- a/xs/xsp/Config.xsp
+++ b/xs/xsp/Config.xsp
@@ -41,6 +41,7 @@
         %code{% THIS->apply(*other, true); %};
     std::vector<std::string> get_keys()
         %code{% THIS->keys(&RETVAL); %};
+    std::string get_extrusion_axis();
 };
 
 %name{Slic3r::Config::PrintRegion} class PrintRegionConfig {