diff --git a/lib/Slic3r/Geometry/Clipper.pm b/lib/Slic3r/Geometry/Clipper.pm
index 17b671a84..46f7f0d87 100644
--- a/lib/Slic3r/Geometry/Clipper.pm
+++ b/lib/Slic3r/Geometry/Clipper.pm
@@ -8,7 +8,7 @@ our @EXPORT_OK = qw(explode_expolygon explode_expolygons safety_offset offset
     diff_ex diff union_ex intersection_ex xor_ex PFT_EVENODD JT_MITER JT_ROUND
     is_counter_clockwise);
 
-use Math::Clipper 1.03 ':all';
+use Math::Clipper 1.05 ':all';
 use Slic3r::Geometry qw(scale);
 our $clipper = Math::Clipper->new;
 
diff --git a/lib/Slic3r/Polygon.pm b/lib/Slic3r/Polygon.pm
index aa8e73f25..110ba2b5c 100644
--- a/lib/Slic3r/Polygon.pm
+++ b/lib/Slic3r/Polygon.pm
@@ -37,6 +37,21 @@ sub lines {
     return @lines;
 }
 
+sub is_counter_clockwise {
+    my $self = shift;
+    return Math::Clipper::is_counter_clockwise($self);
+}
+
+sub make_counter_clockwise {
+    my $self = shift;
+    $self->reverse if !$self->is_counter_clockwise;
+}
+
+sub make_clockwise {
+    my $self = shift;
+    $self->reverse if $self->is_counter_clockwise;
+}
+
 sub cleanup {
     my $self = shift;
     $self->merge_continuous_lines;
diff --git a/lib/Slic3r/Polyline.pm b/lib/Slic3r/Polyline.pm
index e0d63f5ae..7c416e782 100644
--- a/lib/Slic3r/Polyline.pm
+++ b/lib/Slic3r/Polyline.pm
@@ -66,21 +66,6 @@ sub reverse {
     @$self = CORE::reverse @$self;
 }
 
-sub is_counter_clockwise {
-    my $self = shift;
-    return Math::Clipper::is_counter_clockwise($self);
-}
-
-sub make_counter_clockwise {
-    my $self = shift;
-    $self->reverse if !$self->is_counter_clockwise;
-}
-
-sub make_clockwise {
-    my $self = shift;
-    $self->reverse if $self->is_counter_clockwise;
-}
-
 sub nearest_point_to {
     my $self = shift;
     my ($point) = @_;
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 497f6b3a7..667c73da8 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -222,8 +222,8 @@ sub detect_surfaces_type {
         # save surfaces to layer
         @{$layer->slices} = (@bottom, @top, @internal);
         
-        Slic3r::debugf "  layer %d (%d sliced expolygons) has %d bottom, %d top and %d internal surfaces\n",
-            $layer->id, scalar(@{$layer->slices}), scalar(@bottom), scalar(@top), scalar(@internal);
+        Slic3r::debugf "  layer %d has %d bottom, %d top and %d internal surfaces\n",
+            $layer->id, scalar(@bottom), scalar(@top), scalar(@internal);
     }
     
     # clip surfaces to the fill boundaries
diff --git a/lib/Slic3r/TriangleMesh.pm b/lib/Slic3r/TriangleMesh.pm
index ab04cf486..6e0aca0b9 100644
--- a/lib/Slic3r/TriangleMesh.pm
+++ b/lib/Slic3r/TriangleMesh.pm
@@ -245,8 +245,10 @@ sub make_loops {
             $line = $next_line;
         } while ($first_facet_index != $line->facet_index);
     
-        Slic3r::debugf "  Discovered polygon of %d points\n", scalar(@points);
         push @polygons, Slic3r::Polygon->new(@points);
+        Slic3r::debugf "  Discovered %s polygon of %d points\n",
+            ($polygons[-1]->is_counter_clockwise ? 'ccw' : 'cw'), scalar(@points)
+            if $Slic3r::debug;
         pop @polygons if !$polygons[-1]->cleanup;
     }