diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index 4e6d8fd48..321f863e4 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -3,7 +3,7 @@ package Slic3r;
 use strict;
 use warnings;
 
-our $VERSION = "0.5.5b";
+our $VERSION = "0.5.6-beta";
 
 our $debug = 0;
 sub debugf {
diff --git a/lib/Slic3r/Layer.pm b/lib/Slic3r/Layer.pm
index 04baf705c..56ede956c 100644
--- a/lib/Slic3r/Layer.pm
+++ b/lib/Slic3r/Layer.pm
@@ -122,6 +122,18 @@ sub make_surfaces {
                 @$expolygons;
     }
     
+    # the contours must be offsetted by half extrusion width inwards
+    {
+        my $distance = scale $Slic3r::flow_width / 2;
+        my @surfaces = @{$self->slices};
+        @{$self->slices} = ();
+        foreach my $surface (@surfaces) {
+            push @{$self->slices}, map Slic3r::Surface->cast_from_expolygon
+                ($_, surface_type => 'internal'),
+                $surface->expolygon->offset_ex(-$distance);
+        }
+    }
+    
     #use Slic3r::SVG;
     #Slic3r::SVG::output(undef, "surfaces.svg",
     #    polygons        => [ map $_->contour->p, @{$self->surfaces} ],
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 916a99ea9..90b382fb7 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -10,13 +10,11 @@ use XXX;
 has 'x_length' => (
     is          => 'ro',
     required    => 1,
-    coerce      => sub { sprintf '%.0f', $_[0] },
 );
 
 has 'y_length' => (
     is          => 'ro',
     required    => 1,
-    coerce      => sub { sprintf '%.0f', $_[0] },
 );
 
 has 'layers' => (
@@ -181,20 +179,6 @@ sub detect_surfaces_type {
             @$expolygons;
     };
     
-    # the contours must be offsetted by half extrusion width inwards
-    {
-        my $distance = scale $Slic3r::flow_width / 2;
-        foreach my $layer (@{$self->layers}) {
-            my @surfaces = @{$layer->slices};
-            @{$layer->slices} = ();
-            foreach my $surface (@surfaces) {
-                push @{$layer->slices}, map Slic3r::Surface->cast_from_expolygon
-                    ($_, surface_type => 'internal'),
-                    $surface->expolygon->offset_ex(-$distance);
-            }
-        }
-    }
-    
     for (my $i = 0; $i < $self->layer_count; $i++) {
         my $layer = $self->layers->[$i];
         Slic3r::debugf "Detecting solid surfaces for layer %d\n", $layer->id;