diff --git a/SlicerConfiguration/Settings/PrinterSettings.cs b/SlicerConfiguration/Settings/PrinterSettings.cs
index 10e0bef01..469edb075 100644
--- a/SlicerConfiguration/Settings/PrinterSettings.cs
+++ b/SlicerConfiguration/Settings/PrinterSettings.cs
@@ -892,6 +892,24 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 					return false;
 				}
 
+				if (GetValue<double>(SettingsKey.external_perimeter_extrusion_width) > GetValue<double>(SettingsKey.nozzle_diameter) * 4)
+				{
+					string error = "'External Perimeter Extrusion Width' must be less than or equal to the 'Nozzle Diameter' * 4.".Localize();
+					string details = string.Format("External Perimeter Extrusion Width = {0}\nNozzle Diameter = {1}".Localize(), GetValue(SettingsKey.external_perimeter_extrusion_width), GetValue<double>(SettingsKey.nozzle_diameter));
+					string location = "Location: 'Settings & Controls' -> 'Settings' -> 'Filament' -> 'Extrusion' -> 'External Perimeter'".Localize();
+					StyledMessageBox.ShowMessageBox(null, string.Format("{0}\n\n{1}\n\n{2}", error, details, location), "Slice Error".Localize());
+					return false;
+				}
+
+				if (GetValue<double>(SettingsKey.external_perimeter_extrusion_width) <= 0)
+				{
+					string error = "'External Perimeter Extrusion Width' must be greater than 0.".Localize();
+					string details = string.Format("External Perimeter Extrusion Width = {0}".Localize(), GetValue(SettingsKey.external_perimeter_extrusion_width));
+					string location = "Location: 'Settings & Controls' -> 'Settings' -> 'Filament' -> 'Extrusion' -> 'External Perimeter'".Localize();
+					StyledMessageBox.ShowMessageBox(null, string.Format("{0}\n\n{1}\n\n{2}", error, details, location), "Slice Error".Localize());
+					return false;
+				}
+
 				if (GetValue<double>(SettingsKey.min_fan_speed) > 100)
 				{
 					string error = "The Minimum Fan Speed can only go as high as 100%.".Localize();
diff --git a/SlicerConfiguration/Settings/SettingsHelpers.cs b/SlicerConfiguration/Settings/SettingsHelpers.cs
index 5f283bb1c..5afab8961 100644
--- a/SlicerConfiguration/Settings/SettingsHelpers.cs
+++ b/SlicerConfiguration/Settings/SettingsHelpers.cs
@@ -66,6 +66,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 		public const string merge_overlapping_lines = nameof(merge_overlapping_lines);
 		public const string extruder_count = nameof(extruder_count);
 		public const string extruders_share_temperature = nameof(extruders_share_temperature);
+		public const string external_perimeter_extrusion_width = nameof(external_perimeter_extrusion_width);
 		public const string filament_cost = nameof(filament_cost);
 		public const string filament_density = nameof(filament_density);
 		public const string filament_diameter = nameof(filament_diameter);
diff --git a/SlicerConfiguration/SlicerMapping/EngineMappingMatterSlice.cs b/SlicerConfiguration/SlicerMapping/EngineMappingMatterSlice.cs
index b3cdbb722..0ba9f35cf 100644
--- a/SlicerConfiguration/SlicerMapping/EngineMappingMatterSlice.cs
+++ b/SlicerConfiguration/SlicerMapping/EngineMappingMatterSlice.cs
@@ -56,7 +56,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 				new AsCountOrDistance("support_material_interface_layers", "supportInterfaceLayers", SettingsKey.layer_height),
 				new AsCountOrDistance("top_solid_layers", "numberOfTopLayers", SettingsKey.layer_height),
 				new AsCountOrDistance("brims", "numberOfBrimLoops", SettingsKey.nozzle_diameter),
-				new AsPercentOfReferenceOrDirect("external_perimeter_extrusion_width", "outsidePerimeterExtrusionWidth", SettingsKey.nozzle_diameter),
+				new AsPercentOfReferenceOrDirect(SettingsKey.external_perimeter_extrusion_width, SettingsKey.external_perimeter_extrusion_width, SettingsKey.nozzle_diameter),
 				new AsPercentOfReferenceOrDirect("external_perimeter_speed", "outsidePerimeterSpeed", "perimeter_speed"),
 				new AsPercentOfReferenceOrDirect(SettingsKey.first_layer_speed, "firstLayerSpeed", "infill_speed"),
 				new AsPercentOfReferenceOrDirect("raft_print_speed", "raftPrintSpeed", "infill_speed"),
diff --git a/StaticData/Translations/Master.txt b/StaticData/Translations/Master.txt
index e32802b3b..bfdea06cc 100644
--- a/StaticData/Translations/Master.txt
+++ b/StaticData/Translations/Master.txt
@@ -5851,3 +5851,27 @@ Translated:Printing Window...
 English:Only Retract When Crossing Perimeters
 Translated:Only Retract When Crossing Perimeters
 
+English:baby_step_z_offset
+Translated:baby_step_z_offset
+
+English:gcode_arcs
+Translated:gcode_arcs
+
+English:calibration_files
+Translated:calibration_files
+
+English:'External Perimeter Extrusion Width' must be less than or equal to the 'Nozzle Diameter' * 4.
+Translated:'External Perimeter Extrusion Width' must be less than or equal to the 'Nozzle Diameter' * 4.
+
+English:External Perimeter Extrusion Width = {0}\nNozzle Diameter = {1}
+Translated:External Perimeter Extrusion Width = {0}\nNozzle Diameter = {1}
+
+English:Location: 'Settings & Controls' -> 'Settings' -> 'Filament' -> 'Extrusion' -> 'External Perimeter'
+Translated:Location: 'Settings & Controls' -> 'Settings' -> 'Filament' -> 'Extrusion' -> 'External Perimeter'
+
+English:'External Perimeter Extrusion Width' must be greater than 0.
+Translated:'External Perimeter Extrusion Width' must be greater than 0.
+
+English:External Perimeter Extrusion Width = {0}
+Translated:External Perimeter Extrusion Width = {0}
+
diff --git a/Submodules/MatterSlice b/Submodules/MatterSlice
index 87a13e46c..4f7fce255 160000
--- a/Submodules/MatterSlice
+++ b/Submodules/MatterSlice
@@ -1 +1 @@
-Subproject commit 87a13e46cfa54f10838947fde28c7268ed80ded9
+Subproject commit 4f7fce255f7ab6d5b64411243284e9ba2cceea47
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 4640524df..7b17867d1 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 4640524dfb6df9073bab8269d297073cedfaf2b5
+Subproject commit 7b17867d17aba65963fb492a8f97b266fba7dffa