diff --git a/Tests/MatterControl.Tests/MatterControl/ConfigIniTests.cs b/Tests/MatterControl.Tests/MatterControl/ConfigIniTests.cs
index 988942b74..4737c677f 100644
--- a/Tests/MatterControl.Tests/MatterControl/ConfigIniTests.cs
+++ b/Tests/MatterControl.Tests/MatterControl/ConfigIniTests.cs
@@ -335,6 +335,12 @@ namespace MatterControl.Tests.MatterControl
 		{
 			ValidateOnAllPrinters((printer, settings) =>
 			{
+				// Make exception for extruder assignment on 3D Stuffmaker slice files
+				if (printer.Oem == "3D Stuffmaker" && settings.RelativeFilePath.IndexOf(".slice", StringComparison.OrdinalIgnoreCase) != -1)
+				{
+					return;
+				}
+
 				string supportMaterialExtruder = settings.LayerCascade.GetValue("support_material_extruder");
 				if (!string.IsNullOrEmpty(supportMaterialExtruder) && printer.Oem != "Esagono")
 				{