diff --git a/lib/Slic3r/ExPolygon.pm b/lib/Slic3r/ExPolygon.pm
index ec3d92f566..8f244ecb71 100644
--- a/lib/Slic3r/ExPolygon.pm
+++ b/lib/Slic3r/ExPolygon.pm
@@ -30,13 +30,6 @@ sub offset_ex {
     return Slic3r::Geometry::Clipper::offset_ex(\@$self, @_);
 }
 
-sub noncollapsing_offset_ex {
-    my $self = shift;
-    my ($distance, @params) = @_;
-    
-    return $self->offset_ex($distance + 1, @params);
-}
-
 sub bounding_box {
     my $self = shift;
     return $self->contour->bounding_box;
diff --git a/t/adaptive_width.t b/t/adaptive_width.t
new file mode 100644
index 0000000000..7a0baa7527
--- /dev/null
+++ b/t/adaptive_width.t
@@ -0,0 +1,92 @@
+use Test::More;
+use strict;
+use warnings;
+
+plan tests => 32;
+
+BEGIN {
+    use FindBin;
+    use lib "$FindBin::Bin/../lib";
+    use local::lib "$FindBin::Bin/../local-lib";
+}
+
+use List::Util qw(first);
+use Slic3r;
+use Slic3r::Geometry qw(X Y scale epsilon);
+use Slic3r::Surface ':types';
+
+sub scale_points (@) { map [scale $_->[X], scale $_->[Y]], @_ }
+
+{
+    my $test = sub {
+        my ($expolygon, $fw, $expected, $descr) = @_;
+        
+        my $flow = Slic3r::Flow->new(
+            nozzle_diameter => 0.5,
+            height          => 0.4,
+            width           => $fw,
+        );
+        my $slices = Slic3r::Surface::Collection->new;
+        $slices->append(Slic3r::Surface->new(
+            surface_type    => S_TYPE_INTERNAL,
+            expolygon       => $expolygon,
+        ));
+        my $config          = Slic3r::Config::Full->new;
+        my $loops           = Slic3r::ExtrusionPath::Collection->new;
+        my $gap_fill        = Slic3r::ExtrusionPath::Collection->new;
+        my $fill_surfaces   = Slic3r::Surface::Collection->new;
+        my $pg = Slic3r::Layer::PerimeterGenerator->new(
+            $slices, $flow->height, $flow,
+            $config, $config, $config,
+            $loops, $gap_fill, $fill_surfaces,
+        );
+        $pg->process;
+        
+        $loops = $loops->flatten;
+        my @single = grep $_->isa('Slic3r::ExtrusionPath'), @$loops;
+        my @loops  = grep $_->isa('Slic3r::ExtrusionLoop'), @$loops;
+        
+        if (0) {
+            require "Slic3r/SVG.pm";
+            Slic3r::SVG::output(
+                "output.svg",
+                expolygons => [$expolygon],
+                polylines => [ map $_->isa('Slic3r::ExtrusionPath') ? $_->polyline : $_->polygon->split_at_first_point, @$loops ],
+                red_polylines => [ map $_->polyline, @$gap_fill ],
+            );
+        }
+        
+        is scalar(@single),  $expected->{single} // 0, "expected number of single lines ($descr)";
+        is scalar(@loops),   $expected->{loops}  // 0, "expected number of loops ($descr)";
+        is scalar(@$gap_fill), $expected->{gaps} // 0, "expected number of gap fills ($descr)";
+        
+        if ($expected->{single}) {
+            ok abs($loops->[0]->width - $expected->{width}) < epsilon, "single line covers the full width ($descr)";
+        }
+        if ($expected->{loops}) {
+            my $loop_width = $loops[0][0]->width;
+            my $gap_fill_width = @$gap_fill ? $gap_fill->[0]->width : 0;
+            ok $loop_width * $expected->{loops} * 2 + $gap_fill_width > $expected->{width} - epsilon,
+                "loop total width + gap fill covers the full width ($descr)";
+        }
+    };
+    
+    my $fw = 0.7;
+    my $test_rect = sub {
+        my ($width, $expected) = @_;
+        
+        my $e = Slic3r::ExPolygon->new([ scale_points [0,0], [100,0], [100,$width], [0,$width] ]);
+        $expected->{width} = $width;
+        $test->($e, $fw, $expected, $width);
+    };
+    $test_rect->($fw * 1,   { single => 1, gaps => 0 });
+    $test_rect->($fw * 1.3, { single => 1, gaps => 0 });
+    $test_rect->($fw * 1.5, { single => 1, gaps => 0 });
+    $test_rect->($fw * 2,   { loops => 1,  gaps => 0 });
+    $test_rect->($fw * 2.5, { loops => 1,  gaps => 1 });
+    $test_rect->($fw * 3,   { loops => 1,  gaps => 1 });
+    $test_rect->($fw * 3.5, { loops => 2,  gaps => 0 });
+    $test_rect->($fw * 4,   { loops => 2,  gaps => 1 });
+}
+
+__END__
diff --git a/t/dynamic.t b/t/dynamic.t
deleted file mode 100644
index 5d4d3ceb4e..0000000000
--- a/t/dynamic.t
+++ /dev/null
@@ -1,93 +0,0 @@
-use Test::More;
-use strict;
-use warnings;
-
-plan skip_all => 'variable-width paths are currently disabled';
-plan tests => 20;
-
-BEGIN {
-    use FindBin;
-    use lib "$FindBin::Bin/../lib";
-    use local::lib "$FindBin::Bin/../local-lib";
-}
-
-use List::Util qw(first);
-use Slic3r;
-use Slic3r::Geometry qw(X Y scale epsilon);
-use Slic3r::Surface ':types';
-
-sub scale_points (@) { map [scale $_->[X], scale $_->[Y]], @_ }
-
-{
-    my $square = Slic3r::ExPolygon->new([
-        scale_points [0,0], [10,0], [10,10], [0,10],
-    ]);
-    
-    my @offsets = @{$square->noncollapsing_offset_ex(- scale 5)};
-    is scalar @offsets, 1, 'non-collapsing offset';
-}
-
-{
-    local $Slic3r::Config = Slic3r::Config->new(
-        perimeters      => 3,
-    );
-    my $w = 0.7;
-    my $perimeter_flow = Slic3r::Flow->new(
-        nozzle_diameter => 0.5,
-        layer_height    => 0.4,
-        width           => $w,
-    );
-    
-    my $print = Slic3r::Print->new;
-    my $region = Slic3r::Print::Region->new(
-        print => $print,
-        flows => { perimeter => $perimeter_flow },
-    );
-    push @{$print->regions}, $region;
-    my $object = Slic3r::Print::Object->new(
-        print => $print,
-        size  => [1,1],
-    );
-    my $make_layer = sub {
-        my ($width) = @_;
-        my $layer = Slic3r::Layer->new(
-            object => $object,
-            id => 1,
-            slices => [
-                Slic3r::Surface->new(
-                    surface_type    => S_TYPE_INTERNAL,
-                    expolygon       => Slic3r::ExPolygon->new([ scale_points [0,0], [50,0], [50,$width], [0,$width] ]),
-                ),
-            ],
-            thin_walls => [],
-        );
-        my $layerm = $layer->region(0);
-        $layer->make_perimeters;
-        return $layerm;
-    };
-    
-    my %widths = (
-        1   * $w => { perimeters => 1, gaps => 0 },
-        1.3 * $w => { perimeters => 1, gaps => 1, gap_flow_spacing => $perimeter_flow->clone(width => 0.2 * $w)->spacing },
-        1.5 * $w => { perimeters => 1, gaps => 1, gap_flow_spacing => $perimeter_flow->clone(width => 0.5 * $w)->spacing },
-        2   * $w => { perimeters => 1, gaps => 1, gap_flow_spacing => $perimeter_flow->spacing },
-        2.5 * $w => { perimeters => 1, gaps => 1, gap_flow_spacing => $perimeter_flow->clone(width => 1.5 * $w)->spacing },
-        3   * $w => { perimeters => 2, gaps => 0 },
-        4   * $w => { perimeters => 2, gaps => 1, gap_flow_spacing => $perimeter_flow->spacing },
-    );
-    
-    foreach my $width (sort keys %widths) {
-        my $layerm = $make_layer->($width);
-        is scalar @{$layerm->perimeters}, $widths{$width}{perimeters}, 'right number of perimeters';
-        is scalar @{$layerm->thin_fills} ? 1 : 0, $widths{$width}{gaps},
-            ($widths{$width}{gaps} ? 'gaps were filled' : 'no gaps detected');  # TODO: we should check the exact number of gaps, but we need a better medial axis algorithm
-        
-        my @gaps = map $_, @{$layerm->thin_fills};
-        if (@gaps) {
-            ok +(!first { abs($_->flow_spacing - $widths{$width}{gap_flow_spacing}) > epsilon } @gaps),
-                'flow spacing was dynamically adjusted';
-        }
-    }
-}
-
-__END__
diff --git a/xs/src/libslic3r/ExtrusionEntity.hpp b/xs/src/libslic3r/ExtrusionEntity.hpp
index 73b64e2865..b5bff5ab35 100644
--- a/xs/src/libslic3r/ExtrusionEntity.hpp
+++ b/xs/src/libslic3r/ExtrusionEntity.hpp
@@ -142,7 +142,6 @@ class ExtrusionLoop : public ExtrusionEntity
     void split_at(const Point &point, bool prefer_non_overhang = false);
     void clip_end(double distance, ExtrusionPaths* paths) const;
     // Test, whether the point is extruded by a bridging flow.
-    // This used to be used to avoid placing seams on overhangs, but now the EdgeGrid is used instead.
     bool has_overhang_point(const Point &point) const;
     bool is_perimeter() const {
         return this->paths.front().role == erPerimeter
diff --git a/xs/xsp/ExtrusionLoop.xsp b/xs/xsp/ExtrusionLoop.xsp
index 11b728a912..290265b196 100644
--- a/xs/xsp/ExtrusionLoop.xsp
+++ b/xs/xsp/ExtrusionLoop.xsp
@@ -37,7 +37,7 @@ SV*
 ExtrusionLoop::arrayref()
     CODE:
         AV* av = newAV();
-        av_fill(av, THIS->paths.size()-1);
+        if (!THIS->paths.empty()) av_extend(av, THIS->paths.size()-1);
         for (ExtrusionPaths::iterator it = THIS->paths.begin(); it != THIS->paths.end(); ++it) {
             av_store(av, it - THIS->paths.begin(), perl_to_SV_ref(*it));
         }