diff --git a/MatterControlLib/ApplicationView/SettingsValidation.cs b/MatterControlLib/ApplicationView/SettingsValidation.cs
index 41cd420cb..17d96ec30 100644
--- a/MatterControlLib/ApplicationView/SettingsValidation.cs
+++ b/MatterControlLib/ApplicationView/SettingsValidation.cs
@@ -370,6 +370,34 @@ namespace MatterHackers.MatterControl
 						});
 				}
 
+				if (settings.GetValue<double>(SettingsKey.fill_density) <= 0)
+				{
+					errors.Add(
+						new SettingsValidationError(SettingsKey.fill_density)
+						{
+							Error = "{0} should be greater than 0.".Localize().FormatWith(
+								GetSettingsName(SettingsKey.fill_density)),
+							ErrorLevel = ValidationErrorLevel.Warning,
+							ValueDetails = "{0} = {1}".FormatWith(
+								GetSettingsName(SettingsKey.fill_density),
+								settings.GetValue<double>(SettingsKey.fill_density)),
+						});
+				}
+
+				if (settings.GetValue<double>(SettingsKey.perimeters) <= 0)
+				{
+					errors.Add(
+						new SettingsValidationError(SettingsKey.perimeters)
+						{
+							Error = "{0} should be greater than 0.".Localize().FormatWith(
+								GetSettingsName(SettingsKey.perimeters)),
+							ErrorLevel = ValidationErrorLevel.Warning,
+							ValueDetails = "{0} = {1}".FormatWith(
+								GetSettingsName(SettingsKey.perimeters),
+								settings.GetValue<double>(SettingsKey.perimeters)),
+						});
+				}
+
 				if (settings.GetValue<double>(SettingsKey.infill_overlap_perimeter) < -settings.GetValue<double>(SettingsKey.nozzle_diameter)
 					|| settings.GetValue<double>(SettingsKey.infill_overlap_perimeter) > settings.GetValue<double>(SettingsKey.nozzle_diameter))
 				{
diff --git a/Submodules/MatterSlice b/Submodules/MatterSlice
index b35dfe02a..4f71564d2 160000
--- a/Submodules/MatterSlice
+++ b/Submodules/MatterSlice
@@ -1 +1 @@
-Subproject commit b35dfe02a31e3d3c328ab68ebd4c99f50d7759c7
+Subproject commit 4f71564d218f924f454e5b20c11001f7a1a22d79
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 55d36cd0c..3901db65a 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 55d36cd0c334d05389b56d65303462bc309ede2b
+Subproject commit 3901db65a244d449c0aa33b992184eec62953ae7