diff --git a/CustomWidgets/PrintingWindow.cs b/CustomWidgets/PrintingWindow.cs
index bccbe1a44..df4f554e0 100644
--- a/CustomWidgets/PrintingWindow.cs
+++ b/CustomWidgets/PrintingWindow.cs
@@ -64,12 +64,12 @@ namespace MatterHackers.MatterControl.CustomWidgets
 		public override void UpdateTemperatures()
 		{
 			double targetValue = PrinterConnectionAndCommunication.Instance.TargetBedTemperature;
-			double actualValue = PrinterConnectionAndCommunication.Instance.ActualBedTemperature;
+			double actualValue = Math.Max(0, PrinterConnectionAndCommunication.Instance.ActualBedTemperature);
 
 			progressBar.RatioComplete = targetValue != 0 ? actualValue / targetValue : 1;
 
-			this.actualTemp.Text = $"{actualValue:0.#}°";
-			this.targetTemp.Text = $"{targetValue:0.#}°";
+			this.actualTemp.Text = $"{actualValue:0}".PadLeft(3, (char)0x2007) + "°"; // put in padding spaces to make it at least 3 characters
+			this.targetTemp.Text = $"{targetValue:0}".PadLeft(3, (char)0x2007) + "°"; // put in padding spaces to make it at least 3 characters
 		}
 	}
 
@@ -91,12 +91,12 @@ namespace MatterHackers.MatterControl.CustomWidgets
 		public override void UpdateTemperatures()
 		{
 			double targetValue = PrinterConnectionAndCommunication.Instance.GetTargetExtruderTemperature(extruderIndex);
-			double actualValue = PrinterConnectionAndCommunication.Instance.GetActualExtruderTemperature(extruderIndex);
+			double actualValue = Math.Max(0, PrinterConnectionAndCommunication.Instance.GetActualExtruderTemperature(extruderIndex));
 
 			progressBar.RatioComplete = targetValue != 0 ? actualValue / targetValue : 1;
 
-			this.actualTemp.Text = $"{actualValue:0.#}°";
-			this.targetTemp.Text = $"{targetValue:0.#}°";
+			this.actualTemp.Text = $"{actualValue:0}".PadLeft(3, (char)0x2007) + "°"; // put in padding spaces to make it at least 3 characters
+			this.targetTemp.Text = $"{targetValue:0}".PadLeft(3, (char)0x2007) + "°"; // put in padding spaces to make it at least 3 characters
 		}
 	}
 
diff --git a/Submodules/MatterSlice b/Submodules/MatterSlice
index 2554b06f1..5f1a8da09 160000
--- a/Submodules/MatterSlice
+++ b/Submodules/MatterSlice
@@ -1 +1 @@
-Subproject commit 2554b06f10df85926c35ec018d450f2a4cece199
+Subproject commit 5f1a8da0909640654d4faf953d5efd73d121ea82
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 5ce6224fe..5456a59e4 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 5ce6224fed7caf5d6c2faf5d409f758c80c46118
+Subproject commit 5456a59e4c2b96d858be28f9b60baa7a45466f0c