diff --git a/MatterControlLib/PartPreviewWindow/GCodeDetails/GCodeDetails.cs b/MatterControlLib/PartPreviewWindow/GCodeDetails/GCodeDetails.cs
index c5b32ea2c..3311be723 100644
--- a/MatterControlLib/PartPreviewWindow/GCodeDetails/GCodeDetails.cs
+++ b/MatterControlLib/PartPreviewWindow/GCodeDetails/GCodeDetails.cs
@@ -118,7 +118,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 		public static string EstimatedMass(this GCodeFile loadedGCode, PrinterConfig printer)
 		{
-			var totalMass = TotalCost(loadedGCode, printer);
+			var totalMass = TotalMass(loadedGCode, printer);
 			return totalMass <= 0 ? "Unknown" : string.Format("{0:0.00} g", totalMass);
 		}
 
diff --git a/Submodules/MatterSlice b/Submodules/MatterSlice
index ac9ff0914..0f74039ca 160000
--- a/Submodules/MatterSlice
+++ b/Submodules/MatterSlice
@@ -1 +1 @@
-Subproject commit ac9ff0914ad8b0a2c379ef47657f051f4e1edfa0
+Subproject commit 0f74039caf61f41e358eabd700417331f544d264