From d791315b4a0f665034a375b098dbd1c8fbc6fa5f Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sat, 31 Mar 2012 18:32:53 +0200
Subject: [PATCH] Bugfix: fatal error when generating skirt for layers having
 only two-point thin walls. #295

---
 lib/Slic3r/Print.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index e3a2100cd8..497f6b3a7f 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -338,7 +338,7 @@ sub extrude_skirt {
         (map @$_, map @{$_->thin_walls}, @layers),
         (map @{$_->polyline}, map @{$_->support_fills->paths}, grep $_->support_fills, @layers),
     );
-    return if !@points;
+    return if @points < 3;  # at least three points required for a convex hull
     
     # duplicate points to take copies into account
     my @all_points = map move_points($_, @points), @{$self->copies};