diff --git a/Library/Export/StlExport.cs b/Library/Export/StlExport.cs
index 6dd27d46f..bc37cd313 100644
--- a/Library/Export/StlExport.cs
+++ b/Library/Export/StlExport.cs
@@ -63,7 +63,7 @@ namespace MatterHackers.MatterControl.Library.Export
 				return MeshExport.ExportMesh(libraryItem, outputPath);
 			}
 
-			return null;
+			return Task.FromResult(false);
 		}
 	}
 }
diff --git a/PartPreviewWindow/View3D/MeshViewerWidget.cs b/PartPreviewWindow/View3D/MeshViewerWidget.cs
index 288d22376..88d08a277 100644
--- a/PartPreviewWindow/View3D/MeshViewerWidget.cs
+++ b/PartPreviewWindow/View3D/MeshViewerWidget.cs
@@ -431,7 +431,7 @@ namespace MatterHackers.MeshVisualizer
 					item.Mesh.FaceTexture.TryGetValue((item.Mesh.Faces[0], 0), out faceTexture);
 					bool hasPersistableTexture = faceTexture == MeshViewerWidget.ViewOnlyTexture;
 
-					if (item.Persistable)
+					if (item.WorldPersistable())
 					{
 						if (hasPersistableTexture)
 						{
diff --git a/SlicerConfiguration/Slicer.cs b/SlicerConfiguration/Slicer.cs
index e42db173d..752943762 100644
--- a/SlicerConfiguration/Slicer.cs
+++ b/SlicerConfiguration/Slicer.cs
@@ -90,7 +90,8 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 					meshPrintOutputSettings.Clear();
 
 					// Flatten the scene, filtering out items outside of the build volume
-					var meshItemsOnBuildPlate = reloadedItem.VisibleMeshes().Where((item) => item.InsideBuildVolume(printer));
+					var meshItemsOnBuildPlate = reloadedItem.VisibleMeshes().Where((item) => item.InsideBuildVolume(printer)
+						&& item.WorldPersistable());
 
 					if (meshItemsOnBuildPlate.Any())
 					{
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index a95cf487f..bea8649f3 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit a95cf487f2e4ecb5fcb574a6e30f6ed73344a4c6
+Subproject commit bea8649f3e1545c106b93e7bb9c2d18dec7c0332