From 5514c84f2eb1d38275d15626d4453f7c56011621 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Can=20Geli=C5=9F?= <geliscan@gmail.com>
Date: Sun, 24 Sep 2017 21:45:21 +0300
Subject: [PATCH] Fix generating supports for hovering slices (#4129)

---
 lib/Slic3r/Print/SupportMaterial.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Slic3r/Print/SupportMaterial.pm b/lib/Slic3r/Print/SupportMaterial.pm
index 4c25dace2..d3be45394 100644
--- a/lib/Slic3r/Print/SupportMaterial.pm
+++ b/lib/Slic3r/Print/SupportMaterial.pm
@@ -179,8 +179,8 @@ sub contact_area {
                     }
                 
                     $diff = diff(
-                        offset([ map $_->p, @{$layerm->slices} ], -$d),
-                        [ map @$_, @{$lower_layer->slices} ],
+                        [ map $_->p, @{$layerm->slices} ],
+                        offset([ map @$_, @{$lower_layer->slices} ], +$d),
                     );
                 
                     # only enforce spacing from the object ($fw/2) if the threshold angle