diff --git a/MatterControl.MeshOperations/BooleanProcessing.cs b/MatterControl.MeshOperations/BooleanProcessing.cs
index bf08be52a..adcffb18f 100644
--- a/MatterControl.MeshOperations/BooleanProcessing.cs
+++ b/MatterControl.MeshOperations/BooleanProcessing.cs
@@ -68,9 +68,13 @@ namespace MatterHackers.PolygonMesh
 
 		public enum ProcessingModes
 		{
+			[Description("Default CSG processing")]
 			Polygons,
-			ExactLegacy,
+			[Description("Use libigl (windows only)")]
+			libigl,
+			[Description("Experimental Marching Cubes")]
 			Marching_Cubes,
+			[Description("Experimental Dual Contouring")]
 			Dual_Contouring,
 		}
 
@@ -105,7 +109,7 @@ namespace MatterHackers.PolygonMesh
 			{
 				return ExactBySlicing(items, operation, reporter, cancellationToken);
 			}
-			else if (processingMode == ProcessingModes.ExactLegacy)
+			else if (processingMode == ProcessingModes.libigl)
 			{
 				return ExactLegacy(items, operation, processingMode, inputResolution, outputResolution, reporter, cancellationToken);
 			}
@@ -501,6 +505,7 @@ namespace MatterHackers.PolygonMesh
 				}
 			}
 
+			resultsMesh.CleanAndMerge();
 			return resultsMesh;
 		}
 
@@ -615,7 +620,7 @@ namespace MatterHackers.PolygonMesh
 					reporter,
 					cancellationToken);
 			}
-			else if (processingMode == ProcessingModes.ExactLegacy)
+			else if (processingMode == ProcessingModes.libigl)
 			{
 				// only try to run the improved booleans if we are 64 bit and it is there
 				if (externalAssemblyExists && IntPtr.Size == 8)
diff --git a/MatterControlLib/PartPreviewWindow/View3D/Actions/CombineObject3D_2.cs b/MatterControlLib/PartPreviewWindow/View3D/Actions/CombineObject3D_2.cs
index f41dade4c..b9383f487 100644
--- a/MatterControlLib/PartPreviewWindow/View3D/Actions/CombineObject3D_2.cs
+++ b/MatterControlLib/PartPreviewWindow/View3D/Actions/CombineObject3D_2.cs
@@ -49,8 +49,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 			Name = "Combine";
 		}
 
-#if DEBUG
-		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
@@ -61,12 +59,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#else
-		private BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
-		private BooleanProcessing.ProcessingResolution OutputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-		private BooleanProcessing.IplicitSurfaceMethod MeshAnalysis { get; set; }
-		private BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#endif
 
 		public override Task Rebuild()
 		{
@@ -145,12 +137,17 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 			}
 		}
 
+		private bool ProcessPolygons
+        {
+			get => Processing == BooleanProcessing.ProcessingModes.Polygons || Processing == BooleanProcessing.ProcessingModes.libigl;
+        }
+
 		public void UpdateControls(PublicPropertyChange change)
 		{
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(OutputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(MeshAnalysis), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(OutputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(MeshAnalysis), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
 		}
 	}
 }
diff --git a/MatterControlLib/PartPreviewWindow/View3D/Actions/IntersectionObject3D_2.cs b/MatterControlLib/PartPreviewWindow/View3D/Actions/IntersectionObject3D_2.cs
index a0e5855f5..683859d56 100644
--- a/MatterControlLib/PartPreviewWindow/View3D/Actions/IntersectionObject3D_2.cs
+++ b/MatterControlLib/PartPreviewWindow/View3D/Actions/IntersectionObject3D_2.cs
@@ -49,8 +49,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 			Name = "Intersection";
 		}
 
-#if DEBUG
-		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
@@ -61,12 +59,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#else
-		private BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
-		private BooleanProcessing.ProcessingResolution OutputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-		private BooleanProcessing.IplicitSurfaceMethod MeshAnalysis { get; set; }
-		private BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#endif
 
 		public override Task Rebuild()
 		{
@@ -145,12 +137,17 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 			}
 		}
 
+		private bool ProcessPolygons
+		{
+			get => Processing == BooleanProcessing.ProcessingModes.Polygons || Processing == BooleanProcessing.ProcessingModes.libigl;
+		}
+
 		public void UpdateControls(PublicPropertyChange change)
 		{
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(OutputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(MeshAnalysis), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(OutputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(MeshAnalysis), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
 		}
 	}
 }
diff --git a/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractAndReplaceObject3D_2.cs b/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractAndReplaceObject3D_2.cs
index 6c3e95230..63d4ad344 100644
--- a/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractAndReplaceObject3D_2.cs
+++ b/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractAndReplaceObject3D_2.cs
@@ -59,8 +59,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 		[DisplayName("Part(s) to Subtract and Replace")]
 		public SelectedChildren SelectedChildren { get; set; } = new SelectedChildren();
 
-#if DEBUG
-		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
@@ -71,12 +69,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#else
-		private BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
-		private BooleanProcessing.ProcessingResolution OutputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-		private BooleanProcessing.IplicitSurfaceMethod MeshAnalysis { get; set; }
-		private BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#endif
 
 		public void DrawEditor(Object3DControlsLayer layer, List<Object3DView> transparentMeshes, DrawEventArgs e)
 		{
@@ -357,12 +349,17 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 			}
 		}
 
+		private bool ProcessPolygons
+		{
+			get => Processing == BooleanProcessing.ProcessingModes.Polygons || Processing == BooleanProcessing.ProcessingModes.libigl;
+		}
+
 		public void UpdateControls(PublicPropertyChange change)
 		{
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(OutputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(MeshAnalysis), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(OutputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(MeshAnalysis), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
 		}
 	}
 }
\ No newline at end of file
diff --git a/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractObject3D_2.cs b/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractObject3D_2.cs
index ce1dadf86..88fbb3c62 100644
--- a/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractObject3D_2.cs
+++ b/MatterControlLib/PartPreviewWindow/View3D/Actions/SubtractObject3D_2.cs
@@ -56,8 +56,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 		[DisplayName("Part(s) to Subtract")]
 		public SelectedChildren SelectedChildren { get; set; } = new SelectedChildren();
 
-#if DEBUG
-		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
@@ -68,12 +66,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 
 		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
 		public BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#else
-		private BooleanProcessing.ProcessingModes Processing { get; set; } = BooleanProcessing.ProcessingModes.Polygons;
-		private BooleanProcessing.ProcessingResolution OutputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-		private BooleanProcessing.IplicitSurfaceMethod MeshAnalysis { get; set; }
-		private BooleanProcessing.ProcessingResolution InputResolution { get; set; } = BooleanProcessing.ProcessingResolution._64;
-#endif
+
 		public bool RemoveSubtractObjects { get; set; } = true;
 
 		public void DrawEditor(Object3DControlsLayer layer, List<Object3DView> transparentMeshes, DrawEventArgs e)
@@ -331,12 +324,17 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 			}
 		}
 
+		private bool ProcessPolygons
+		{
+			get => Processing == BooleanProcessing.ProcessingModes.Polygons || Processing == BooleanProcessing.ProcessingModes.libigl;
+		}
+
 		public void UpdateControls(PublicPropertyChange change)
 		{
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(OutputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(MeshAnalysis), () => Processing != BooleanProcessing.ProcessingModes.Polygons);
-			change.SetRowVisible(nameof(InputResolution), () => Processing != BooleanProcessing.ProcessingModes.Polygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(OutputResolution), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(MeshAnalysis), () => !ProcessPolygons);
+			change.SetRowVisible(nameof(InputResolution), () => !ProcessPolygons && MeshAnalysis == BooleanProcessing.IplicitSurfaceMethod.Grid);
 		}
 	}
 }
\ No newline at end of file
diff --git a/Submodules/MatterSlice b/Submodules/MatterSlice
index 6f186b40a..5d28a459f 160000
--- a/Submodules/MatterSlice
+++ b/Submodules/MatterSlice
@@ -1 +1 @@
-Subproject commit 6f186b40afc527eeb20eb8380f26f4102b1e7ac2
+Subproject commit 5d28a459fcccec0e5aed236b35c02d47dc67b40d