From 548b3014321c8a6e6efbbe68dc589bdcca6a0f40 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Fri, 9 Aug 2013 16:34:55 +0200
Subject: [PATCH] Offset projection of facets before the final union

---
 lib/Slic3r/TriangleMesh.pm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/Slic3r/TriangleMesh.pm b/lib/Slic3r/TriangleMesh.pm
index c2e543467..5aa97c9a0 100644
--- a/lib/Slic3r/TriangleMesh.pm
+++ b/lib/Slic3r/TriangleMesh.pm
@@ -563,7 +563,9 @@ sub horizontal_projection {
     }
     
     $_->make_counter_clockwise for @f;  # do this after scaling, as winding order might change while doing that
-    return union_ex(\@f, 1);
+    
+    # the offset factor was tuned using groovemount.stl
+    return union_ex([ offset(\@f, Slic3r::Geometry::scale 0.01) ], 1);
 }
 
 1;