diff --git a/MatterControl.Printing/Settings/SliceSettingsFields.cs b/MatterControl.Printing/Settings/SliceSettingsFields.cs
index daa2c77e3..a8570b72b 100644
--- a/MatterControl.Printing/Settings/SliceSettingsFields.cs
+++ b/MatterControl.Printing/Settings/SliceSettingsFields.cs
@@ -463,9 +463,10 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 					SlicerConfigName = SettingsKey.extrusion_multiplier,
 					PresentationName = "Extrusion Multiplier".Localize(),
 					HelpText = "All extrusions are multiplied by this value. Increasing it above 1 will increase the amount of filament being extruded (1.1 is a good max value); decreasing it will decrease the amount being extruded (.9 is a good minimum value).".Localize(),
-					DataEditType = DataEditTypes.POSITIVE_DOUBLE,
+					DataEditType = DataEditTypes.DOUBLE_OR_PERCENT,
+					Units = "Ratio or %",
 					ShowIfSet = "!sla_printer",
-					DefaultValue = "1"
+					DefaultValue = "100%"
 				},
 				new SliceSettingData()
 				{
diff --git a/MatterControlLib/SlicerConfiguration/EngineMappingMatterSlice.cs b/MatterControlLib/SlicerConfiguration/EngineMappingMatterSlice.cs
index 6ab08401c..bb8f69bc6 100644
--- a/MatterControlLib/SlicerConfiguration/EngineMappingMatterSlice.cs
+++ b/MatterControlLib/SlicerConfiguration/EngineMappingMatterSlice.cs
@@ -177,7 +177,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 				new OverrideSpeedOnSlaPrinters(printer, SettingsKey.air_gap_speed, "airGapSpeed", SettingsKey.infill_speed),
 				new OverrideSpeedOnSlaPrinters(printer, SettingsKey.bottom_infill_speed, "bottomInfillSpeed", SettingsKey.infill_speed),
 				new MappedToBoolString(printer, SettingsKey.bridge_over_infill, "bridgeOverInfill"),
-				new MappedSetting(printer, SettingsKey.extrusion_multiplier, "extrusionMultiplier"),
+				new AsPercentOrDirect(printer, SettingsKey.extrusion_multiplier, "extrusionMultiplier"),
 				new MappedSetting(printer, SettingsKey.fill_angle, "infillStartingAngle"),
 				new AsPercentOfReferenceOrDirect(printer, SettingsKey.infill_overlap_perimeter, "infillExtendIntoPerimeter", SettingsKey.nozzle_diameter, change0ToReference: false),
 				new OverrideSpeedOnSlaPrinters(printer, SettingsKey.infill_speed, "infillSpeed", SettingsKey.infill_speed),
diff --git a/MatterControlLib/SlicerConfiguration/MappingClasses/AsPercentOrDirect.cs b/MatterControlLib/SlicerConfiguration/MappingClasses/AsPercentOrDirect.cs
new file mode 100644
index 000000000..be4ede055
--- /dev/null
+++ b/MatterControlLib/SlicerConfiguration/MappingClasses/AsPercentOrDirect.cs
@@ -0,0 +1,58 @@
+/*
+Copyright (c) 2016, Lars Brubaker
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are those
+of the authors and should not be interpreted as representing official policies,
+either expressed or implied, of the FreeBSD Project.
+*/
+
+namespace MatterHackers.MatterControl.SlicerConfiguration.MappingClasses
+{
+	public class AsPercentOrDirect : MappedSetting
+	{
+		public AsPercentOrDirect(PrinterConfig printer, string canonicalSettingsName, string exportedName)
+			: base(printer, canonicalSettingsName, exportedName)
+		{
+		}
+
+		public override string Value
+		{
+			get
+			{
+				double finalValue = 0;
+				if (base.Value.Contains("%"))
+				{
+					string withoutPercent = base.Value.Replace("%", "");
+					finalValue = ParseDouble(withoutPercent) / 100.0;
+				}
+				else
+				{
+					finalValue = ParseDouble(base.Value);
+				}
+
+				return finalValue.ToString();
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 1177a0b85..14f4fb447 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 1177a0b85bf5f3057547de13bd4e500640fa8c7c
+Subproject commit 14f4fb447f973f2f52fd787e014757ca6d06820e