From f08ebe97b2bab472c5031b68b8d674ab860b5529 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Fri, 30 Dec 2011 18:51:48 +0100
Subject: [PATCH] Bugfix: fatal error for some models and thin walls not
 considered for skirt

---
 lib/Slic3r/Layer.pm | 1 +
 lib/Slic3r/Print.pm | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Slic3r/Layer.pm b/lib/Slic3r/Layer.pm
index 78ef1c9b85..b924e1902a 100644
--- a/lib/Slic3r/Layer.pm
+++ b/lib/Slic3r/Layer.pm
@@ -171,6 +171,7 @@ sub make_surfaces {
         my $diff = diff_ex(
             [ map $_->p, @surfaces ],
             $outgrown,
+            1,
         );
         
         push @{$self->thin_walls},
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 54dd602fca..97eb0a399e 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -330,7 +330,7 @@ sub extrude_skirt {
     my $skirt_height = $Slic3r::skirt_height;
     $skirt_height = $self->layer_count if $skirt_height > $self->layer_count;
     my @layers = map $self->layer($_), 0..($skirt_height-1);
-    my @points = map @$_, map $_->p, map @{ $_->slices }, @layers;
+    my @points = map @$_, map $_->p, map +(@{$_->slices}, @{$_->thin_walls}), @layers;
     return if !@points;
     
     # find out convex hull