diff --git a/CuraEngine-clipper51x.patch b/CuraEngine-clipper51x.patch
deleted file mode 100644
index b171104..0000000
--- a/CuraEngine-clipper51x.patch
+++ /dev/null
@@ -1,82 +0,0 @@
-From 2f6d8132a66b142541ed9a6ab21c7ebf800de13c Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= <miro@hroncok.cz>
-Date: Sun, 23 Jun 2013 16:30:24 +0200
-Subject: [PATCH] Added PolyTreeToExPolygons function form Clipper
- documentation and introduced support for Clipper 5.1.x
-
----
- layerPart.h | 47 ++++++++++++++++++++++++++++++++++++++++++++---
- 1 file changed, 44 insertions(+), 3 deletions(-)
-
-diff --git a/layerPart.h b/layerPart.h
-index 1be61f6..ea52eca 100644
---- a/layerPart.h
-+++ b/layerPart.h
-@@ -15,6 +15,44 @@
- */
- 
- 
-+//////////////////////////////////////////////////////////////////////////////////////////
-+//
-+// old API compatibility
-+// polytree to expolygons
-+// http://www.angusj.com/delphi/clipper/documentation/Docs/Units/ClipperLib/Types/ExPolygons.htm
-+
-+struct ExPolygon
-+{
-+    ClipperLib::Polygon outer;
-+    ClipperLib::Polygons holes;
-+};
-+typedef std::vector<ExPolygon> ExPolygons;
-+
-+void AddOuterPolyNodeToExPolygons(const ClipperLib::PolyNode * polynode, ExPolygons& expolygons)
-+{
-+    size_t cnt = expolygons.size();
-+    expolygons.resize(cnt + 1);
-+    expolygons[cnt].outer = polynode->Contour;
-+    expolygons[cnt].holes.resize(polynode->ChildCount());
-+    for (int i = 0; i < polynode->ChildCount(); ++i)
-+    {
-+        expolygons[cnt].holes[i] = polynode->Childs[i]->Contour;
-+        //Add outer polygons contained by (nested within) holes ...
-+        for (int j = 0; j < polynode->Childs[i]->ChildCount(); ++j)
-+            AddOuterPolyNodeToExPolygons(polynode->Childs[i]->Childs[j], expolygons);
-+    }
-+}
-+
-+void PolyTreeToExPolygons(const ClipperLib::PolyTree * polytree, ExPolygons& expolygons)
-+{
-+    expolygons.clear();
-+    for (int i = 0; i < polytree->ChildCount(); ++i)
-+        AddOuterPolyNodeToExPolygons(polytree->Childs[i], expolygons);
-+}
-+
-+//
-+//////////////////////////////////////////////////////////////////////////////////////////
-+
- void createLayerWithParts(SliceLayer& storageLayer, SlicerLayer* layer, int unionAllType)
- {
-     ClipperLib::Polygons polyList;
-@@ -31,13 +69,16 @@ void createLayerWithParts(SliceLayer& storageLayer, SlicerLayer* layer, int unio
-         polyList.push_back(p);
-     }
-     
--    ClipperLib::ExPolygons resultPolys;
-+    ExPolygons resultPolys;
-+    ClipperLib::PolyTree resultPolyTree;
-     ClipperLib::Clipper clipper;
-     clipper.AddPolygons(polyList, ClipperLib::ptSubject);
-     if (unionAllType)
--        clipper.Execute(ClipperLib::ctUnion, resultPolys, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
-+        clipper.Execute(ClipperLib::ctUnion, resultPolyTree, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
-     else
--        clipper.Execute(ClipperLib::ctUnion, resultPolys);
-+        clipper.Execute(ClipperLib::ctUnion, resultPolyTree);
-+    
-+    PolyTreeToExPolygons(&resultPolyTree, resultPolys);
-     
-     for(unsigned int i=0; i<resultPolys.size(); i++)
-     {
--- 
-1.8.1.6
-