diff --git a/PartPreviewWindow/View3D/DifferenceObject3D.cs b/PartPreviewWindow/View3D/DifferenceObject3D.cs
index 1a4c57f42..7faf86731 100644
--- a/PartPreviewWindow/View3D/DifferenceObject3D.cs
+++ b/PartPreviewWindow/View3D/DifferenceObject3D.cs
@@ -122,9 +122,9 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 				if (removeObjects.Any()
 					&& keepObjects.Any())
 				{
-					foreach (var keep in keepObjects)
+					foreach (var remove in removeObjects)
 					{
-						foreach (var remove in removeObjects)
+						foreach (var keep in keepObjects)
 						{
 							var transformedRemove = Mesh.Copy(remove.Mesh, CancellationToken.None);
 							transformedRemove.Transform(remove.WorldMatrix());
@@ -138,6 +138,8 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 							transformedKeep.Transform(inverse);
 							keep.Mesh = transformedKeep;
 						}
+
+						remove.Visible = false;
 					}
 				}
 			});
diff --git a/PartPreviewWindow/View3D/MeshViewerWidget.cs b/PartPreviewWindow/View3D/MeshViewerWidget.cs
index 4982b2932..f63fd5fd9 100644
--- a/PartPreviewWindow/View3D/MeshViewerWidget.cs
+++ b/PartPreviewWindow/View3D/MeshViewerWidget.cs
@@ -498,7 +498,10 @@ namespace MatterHackers.MeshVisualizer
 			List<MeshRenderData> transparentMeshes = new List<MeshRenderData>();
 			foreach (var object3D in scene.Children)
 			{
-				DrawObject(object3D, transparentMeshes, false, e);
+				if (object3D.Visible)
+				{
+					DrawObject(object3D, transparentMeshes, false, e);
+				}
 			}
 
 			transparentMeshes.Sort(BackToFrontXY);
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 48c14ef06..0a95f55e7 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 48c14ef068f4ca06f2c5c60d9c4fd9baf282575a
+Subproject commit 0a95f55e75773792ee7d9e5be709d73e6a615b35