New raft_layers option. #123

README.markdown

@@ -209,6 +209,7 @@ The author of the Silk icon set is Mark James.
                             Spacing between pattern lines (mm, default: 2.5)
         --support-material-angle
                             Support material angle in degrees (range: 0-90, default: 0)
+        --raft-layers       Number of layers to raise the printed objects by (range: 0+, default: 0)
       
        Retraction options:
         --retract-length    Length of retraction in mm when pausing extrusion (default: 1)

lib/Slic3r/Config.pm

@@ -578,6 +578,14 @@ our $Options = {
         type    => 'i',
         default => 0,
     },
+    'raft_layers' => {
+        label   => 'Raft layers',
+        tooltip => 'Number of total raft layers to insert below the object(s).',
+        sidetext => 'layers',
+        cli     => 'raft-layers=i',
+        type    => 'i',
+        default => 0,
+    },
     'start_gcode' => {
         label   => 'Start G-code',
         tooltip => 'This start procedure is inserted at the beginning of the output file, right after the temperature control commands for extruder and bed. If Slic3r detects M104 or M190 in your custom codes, such commands will not be prepended automatically. Note that you can use placeholder variables for all Slic3r settings, so you can put a "M104 S[first_layer_temperature]" command wherever you want.',

lib/Slic3r/GUI/Tab.pm

@@ -456,6 +456,10 @@ sub build {
             title => 'Support material',
             options => [qw(support_material support_material_threshold support_material_pattern support_material_spacing support_material_angle)],
         },
+        {
+            title => 'Raft',
+            options => [qw(raft_layers)],
+        },
     ]);
     
     $self->add_options_page('Notes', 'note.png', optgroups => [

lib/Slic3r/Layer.pm

@@ -2,6 +2,7 @@ package Slic3r::Layer;
 use Moo;
 
 use List::Util qw(first);
+use Slic3r::Geometry qw(scale);
 use Slic3r::Geometry::Clipper qw(union_ex);
 
 has 'id'                => (is => 'rw', required => 1, trigger => 1); # sequential number of layer, 0-based
@@ -32,11 +33,16 @@ sub _trigger_id {
 sub _build_slice_z {
     my $self = shift;
     
-    if ($self->id == 0) {
-        return $Slic3r::Config->get_value('first_layer_height') / 2 / &Slic3r::SCALING_FACTOR;
+    if ($Slic3r::Config->raft_layers == 0) {
+        if ($self->id == 0) {
+            return scale $Slic3r::Config->get_value('first_layer_height') / 2;
+        }
+        return scale($Slic3r::Config->get_value('first_layer_height') + ($self->id-1 + 0.5) * $Slic3r::Config->layer_height);
+    } else {
+        return -1 if $self->id < $Slic3r::Config->raft_layers;
+        my $object_layer_id = $self->id - $Slic3r::Config->raft_layers;
+        return scale ($object_layer_id + 0.5) * $Slic3r::Config->layer_height;
     }
-    return ($Slic3r::Config->get_value('first_layer_height') + (($self->id-1) * $Slic3r::Config->layer_height) + ($Slic3r::Config->layer_height/2))
-        / &Slic3r::SCALING_FACTOR;  #/
 }
 
 # Z used for printing in scaled coordinates

lib/Slic3r/Print/Object.pm

@@ -173,9 +173,10 @@ sub slice {
     }
     
     # remove empty layers from bottom
-    while (@{$self->layers} && !@{$self->layers->[0]->slices} && !map @{$_->thin_walls}, @{$self->layers->[0]->regions}) {
-        shift @{$self->layers};
-        for (my $i = 0; $i <= $#{$self->layers}; $i++) {
+    my $first_object_layer_id = $Slic3r::Config->raft_layers;
+    while (@{$self->layers} && !@{$self->layers->[$first_object_layer_id]->slices} && !map @{$_->thin_walls}, @{$self->layers->[$first_object_layer_id]->regions}) {
+        splice @{$self->layers}, $first_object_layer_id, 1;
+        for (my $i = $first_object_layer_id; $i <= $#{$self->layers}; $i++) {
             $self->layers->[$i]->id($i);
         }
     }

slic3r.pl

@@ -257,6 +257,7 @@ $j
                         Spacing between pattern lines (mm, default: $config->{support_material_spacing})
     --support-material-angle
                         Support material angle in degrees (range: 0-90, default: $config->{support_material_angle})
+    --raft-layers       Number of layers to raise the printed objects by (range: 0+, default: $config->{raft_layers})
   
    Retraction options:
     --retract-length    Length of retraction in mm when pausing extrusion (default: $config->{retract_length}[0])