diff --git a/lib/Slic3r/ExPolygon.pm b/lib/Slic3r/ExPolygon.pm
index ae11781a..a7b636fc 100644
--- a/lib/Slic3r/ExPolygon.pm
+++ b/lib/Slic3r/ExPolygon.pm
@@ -5,7 +5,7 @@ use warnings;
 # an ExPolygon is a polygon with holes
 
 use Math::Geometry::Voronoi;
-use Slic3r::Geometry qw(X Y A B point_in_polygon);
+use Slic3r::Geometry qw(X Y A B point_in_polygon same_line);
 use Slic3r::Geometry::Clipper qw(union_ex JT_MITER);
 
 # the constructor accepts an array of polygons 
@@ -93,6 +93,14 @@ sub encloses_point {
             || grep($_->point_on_segment($point), $self->holes));
 }
 
+sub encloses_line {
+    my $self = shift;
+    my ($line) = @_;
+    
+    my $clip = $self->clip_line($line);
+    return @$clip == 1 && same_line($clip->[0], $line);
+}
+
 sub point_on_segment {
     my $self = shift;
     my ($point) = @_;
diff --git a/lib/Slic3r/Fill/Rectilinear.pm b/lib/Slic3r/Fill/Rectilinear.pm
index 5394e752..7eda20d2 100644
--- a/lib/Slic3r/Fill/Rectilinear.pm
+++ b/lib/Slic3r/Fill/Rectilinear.pm
@@ -15,9 +15,8 @@ sub fill_surface {
     my $rotate_vector = $self->infill_direction($surface);
     $self->rotate_points($expolygon, $rotate_vector);
     
-    my $bounding_box = [ $expolygon->bounding_box ];
-    $bounding_box->[X1] += scale 0.1;
-    $bounding_box->[X2] -= scale 0.1;
+    my ($expolygon_off) = $expolygon->offset_ex(scale 0.2);
+    my $bounding_box = [ $expolygon_off->bounding_box ];
     
     my $min_spacing = scale $params{flow_spacing};
     my $distance_between_lines = $min_spacing / $params{density};
@@ -59,11 +58,9 @@ sub fill_surface {
         );
         @paths = ();
         
-        # the 1 below disables the fix for connection lines being extruded outside $expolygon
-        # (this happens to gears, for example).  it works, but it's 30% slower with it enabled
         my $can_connect = $is_line_pattern
             ? sub { $_[X] <= (abs((($_[2][Y] - $bounding_box->[Y1])*(2 * $line_oscillation)/($bounding_box->[Y2] - $bounding_box->[Y1])) - $line_oscillation) + $distance_between_lines) && $_[Y] <= $distance_between_lines * 5 }
-            : sub { ($_[X] >= $distance_between_lines - epsilon) && ($_[X] <= $distance_between_lines + epsilon) && ($_[Y] <= $distance_between_lines * 5) && (1 || $expolygon->encloses_point(Slic3r::Line->new(@_[2,3])->midpoint)) };
+            : sub { ($_[X] >= $distance_between_lines - epsilon) && ($_[X] <= $distance_between_lines + epsilon) && ($_[Y] <= $distance_between_lines * 5) };
         
         foreach my $path ($collection->shortest_path) {
             if (@paths) {
@@ -71,7 +68,8 @@ sub fill_surface {
                 
                 # TODO: we should also check that both points are on a fill_boundary to avoid 
                 # connecting paths on the boundaries of internal regions
-                if ($can_connect->(@distance, $paths[-1][-1], $path->points->[0])) {
+                if ($can_connect->(@distance, $paths[-1][-1], $path->points->[0])
+                    && $expolygon_off->encloses_line([ $paths[-1][-1], $path->points->[0] ])) {
                     push @{$paths[-1]}, @{$path->points};
                     next;
                 }
diff --git a/lib/Slic3r/Geometry.pm b/lib/Slic3r/Geometry.pm
index 3291eb4f..a39bb305 100644
--- a/lib/Slic3r/Geometry.pm
+++ b/lib/Slic3r/Geometry.pm
@@ -13,7 +13,7 @@ our @EXPORT_OK = qw(
     polygon_has_vertex polyline_length can_connect_points deg2rad rad2deg
     rotate_points move_points remove_coinciding_points clip_segment_polygon
     sum_vectors multiply_vector subtract_vectors dot perp polygon_points_visibility
-    line_intersection bounding_box bounding_box_intersect same_point
+    line_intersection bounding_box bounding_box_intersect same_point same_line
     longest_segment angle3points three_points_aligned line_direction
     polyline_remove_parallel_continuous_edges polyline_remove_acute_vertices
     polygon_remove_acute_vertices polygon_remove_parallel_continuous_edges
@@ -103,6 +103,11 @@ sub same_point {
     return $p1->[X] == $p2->[X] && $p1->[Y] == $p2->[Y];
 }
 
+sub same_line {
+    my ($line1, $line2) = @_;
+    return same_point($line1->[A], $line2->[A]) && same_point($line1->[B], $line2->[B]);
+}
+
 sub distance_between_points {
     my ($p1, $p2) = @_;
     return sqrt((($p1->[X] - $p2->[X])**2) + ($p1->[Y] - $p2->[Y])**2);