diff --git a/MatterControlLib/DesignTools/Operations/Image/ImageToPathObject3D_2.cs b/MatterControlLib/DesignTools/Operations/Image/ImageToPathObject3D_2.cs
index e6e3bfbeb..86bfb9443 100644
--- a/MatterControlLib/DesignTools/Operations/Image/ImageToPathObject3D_2.cs
+++ b/MatterControlLib/DesignTools/Operations/Image/ImageToPathObject3D_2.cs
@@ -52,7 +52,7 @@ using Polygons = System.Collections.Generic.List<System.Collections.Generic.List
 namespace MatterHackers.MatterControl.DesignTools
 {
 	[HideMeterialAndColor]
-    public class ImageToPathObject3D_2 : PathObject3D, IImageProvider, IEditorDraw, IObject3DControlsProvider, IPropertyGridModifier, IEditorWidgetModifier
+    public class ImageToPathObject3D_2 : PathObject3D, IImageProvider, IObject3DControlsProvider, IPropertyGridModifier, IEditorWidgetModifier
     {
 		public ImageToPathObject3D_2()
 		{
diff --git a/MatterControlLib/Library/Export/StlExport.cs b/MatterControlLib/Library/Export/StlExport.cs
index b38678700..712ce3ff4 100644
--- a/MatterControlLib/Library/Export/StlExport.cs
+++ b/MatterControlLib/Library/Export/StlExport.cs
@@ -139,9 +139,10 @@ namespace MatterHackers.MatterControl.Library.Export
             };
 			unionAllPartsCheckbox.CheckedStateChanged += (s, e) =>
 			{
-				mergeMeshes = unionAllPartsCheckbox.Checked;
+                radioButton.InvokeClick();
+                mergeMeshes = unionAllPartsCheckbox.Checked;
 			};
-			container.AddChild(unionAllPartsCheckbox);
+            container.AddChild(unionAllPartsCheckbox);
 
             // add separate checkbox
             var saveAsSeparateSTLsCheckbox = new CheckBox("Save Each Separately".Localize(), theme.TextColor, 10)
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 1095d549d..3b8d517ed 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 1095d549d0fb12e216ee630631c45558c0087390
+Subproject commit 3b8d517ed651a37de5eab97a29e5bd497ddb9752