diff --git a/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs b/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs
index 5d4d04ebf..9cd362eef 100644
--- a/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs
+++ b/MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs
@@ -1785,7 +1785,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 					}
 					double xToSnap = xSnapOffset + delta.X;
 
-					double snappedX = ((int)((xToSnap / snapGridDistance) + .5)) * snapGridDistance;
+					double snappedX = Math.Round(xToSnap / snapGridDistance) * snapGridDistance;
 					delta.X = snappedX - xSnapOffset;
 
 					double ySnapOffset = selectedBounds.MinXYZ.Y;
@@ -1798,7 +1798,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 					}
 					double yToSnap = ySnapOffset + delta.Y;
 
-					double snappedY = ((int)((yToSnap / snapGridDistance) + .5)) * snapGridDistance;
+					double snappedY = Math.Round(yToSnap / snapGridDistance) * snapGridDistance;
 					delta.Y = snappedY - ySnapOffset;
 				}
 
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index b5824a230..a4a900756 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit b5824a2309f04f710250bd75dfb2f5cfada5a7bc
+Subproject commit a4a900756db5e0c310c6ff49762aa4414320854c