diff --git a/PrinterCommunication/Io/ExtrusionMultiplyerStream.cs b/PrinterCommunication/Io/ExtrusionMultiplyerStream.cs
index 503e9c42d..fccb4861d 100644
--- a/PrinterCommunication/Io/ExtrusionMultiplyerStream.cs
+++ b/PrinterCommunication/Io/ExtrusionMultiplyerStream.cs
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2015, Lars Brubaker
+Copyright (c) 2017, Lars Brubaker, John Lewin
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -27,56 +27,77 @@ of the authors and should not be interpreted as representing official policies,
 either expressed or implied, of the FreeBSD Project.
 */
 
+using System;
+using MatterHackers.Agg.UI;
 using MatterHackers.GCodeVisualizer;
+using MatterHackers.MatterControl.SlicerConfiguration;
 using MatterHackers.VectorMath;
 
 namespace MatterHackers.MatterControl.PrinterCommunication.Io
 {
-    public class ExtrusionMultiplyerStream : GCodeStreamProxy
-    {
-        private double currentActualExtrusionPosition = 0;
-        private double previousGcodeRequestedExtrusionPosition = 0;
+	public class ExtrusionMultiplyerStream : GCodeStreamProxy
+	{
+		private double currentActualExtrusionPosition = 0;
+		private double previousGcodeRequestedExtrusionPosition = 0;
 
-        public ExtrusionMultiplyerStream(GCodeStream internalStream)
-            : base(internalStream)
-        {
-        }
+		private EventHandler unregisterEvents;
 
-        public double ExtrusionRatio { get; set; } = 1;
+		public ExtrusionMultiplyerStream(GCodeStream internalStream)
+			: base(internalStream)
+		{
+			this.ExtrusionRatio = ActiveSliceSettings.Instance.GetValue<double>(SettingsKey.extrusion_ratio);
 
-        public override string ReadLine()
-        {
-            return ApplyExtrusionMultiplier(internalStream.ReadLine());
-        }
+			ActiveSliceSettings.SettingChanged.RegisterEvent((s, e) =>
+			{
+				var eventArgs = e as StringEventArgs;
+				if (eventArgs?.Data == SettingsKey.extrusion_ratio)
+				{
+					this.ExtrusionRatio = ActiveSliceSettings.Instance.GetValue<double>(SettingsKey.extrusion_ratio);
+				}
+			}, ref unregisterEvents);
+		}
 
-        private string ApplyExtrusionMultiplier(string lineBeingSent)
-        {
-            if (lineBeingSent != null)
-            {
-                if (LineIsMovement(lineBeingSent))
-                {
-                    double gcodeRequestedExtrusionPosition = 0;
-                    if (GCodeFile.GetFirstNumberAfter("E", lineBeingSent, ref gcodeRequestedExtrusionPosition))
-                    {
-                        double delta = gcodeRequestedExtrusionPosition - previousGcodeRequestedExtrusionPosition;
-                        double newActualExtruderPosition = currentActualExtrusionPosition + delta * ExtrusionRatio;
-                        lineBeingSent = GCodeFile.ReplaceNumberAfter('E', lineBeingSent, newActualExtruderPosition);
-                        previousGcodeRequestedExtrusionPosition = gcodeRequestedExtrusionPosition;
-                        currentActualExtrusionPosition = newActualExtruderPosition;
-                    }
-                }
-                else if (lineBeingSent.StartsWith("G92"))
-                {
-                    double gcodeRequestedExtrusionPosition = 0;
-                    if (GCodeFile.GetFirstNumberAfter("E", lineBeingSent, ref gcodeRequestedExtrusionPosition))
-                    {
-                        previousGcodeRequestedExtrusionPosition = gcodeRequestedExtrusionPosition;
-                        currentActualExtrusionPosition = gcodeRequestedExtrusionPosition;
-                    }
-                }
-            }
+		public double ExtrusionRatio { get; set; }
 
-            return lineBeingSent;
-        }
-    }
+		public override string ReadLine()
+		{
+			return ApplyExtrusionMultiplier(internalStream.ReadLine());
+		}
+
+		private string ApplyExtrusionMultiplier(string lineBeingSent)
+		{
+			if (lineBeingSent != null)
+			{
+				if (LineIsMovement(lineBeingSent))
+				{
+					double gcodeRequestedExtrusionPosition = 0;
+					if (GCodeFile.GetFirstNumberAfter("E", lineBeingSent, ref gcodeRequestedExtrusionPosition))
+					{
+						double delta = gcodeRequestedExtrusionPosition - previousGcodeRequestedExtrusionPosition;
+						double newActualExtruderPosition = currentActualExtrusionPosition + delta * ExtrusionRatio;
+						lineBeingSent = GCodeFile.ReplaceNumberAfter('E', lineBeingSent, newActualExtruderPosition);
+						previousGcodeRequestedExtrusionPosition = gcodeRequestedExtrusionPosition;
+						currentActualExtrusionPosition = newActualExtruderPosition;
+					}
+				}
+				else if (lineBeingSent.StartsWith("G92"))
+				{
+					double gcodeRequestedExtrusionPosition = 0;
+					if (GCodeFile.GetFirstNumberAfter("E", lineBeingSent, ref gcodeRequestedExtrusionPosition))
+					{
+						previousGcodeRequestedExtrusionPosition = gcodeRequestedExtrusionPosition;
+						currentActualExtrusionPosition = gcodeRequestedExtrusionPosition;
+					}
+				}
+			}
+
+			return lineBeingSent;
+		}
+
+		public override void Dispose()
+		{
+			unregisterEvents?.Invoke(null, null);
+			base.Dispose();
+		}
+	}
 }
\ No newline at end of file
diff --git a/PrinterCommunication/Io/FeedRateMultiplyerStream.cs b/PrinterCommunication/Io/FeedRateMultiplyerStream.cs
index c3fb62cc0..62a5538ec 100644
--- a/PrinterCommunication/Io/FeedRateMultiplyerStream.cs
+++ b/PrinterCommunication/Io/FeedRateMultiplyerStream.cs
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2015, Lars Brubaker
+Copyright (c) 2017, Lars Brubaker, John Lewin
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -27,8 +27,9 @@ of the authors and should not be interpreted as representing official policies,
 either expressed or implied, of the FreeBSD Project.
 */
 
-using MatterHackers.GCodeVisualizer;
-using MatterHackers.VectorMath;
+using System;
+using MatterHackers.Agg.UI;
+using MatterHackers.MatterControl.SlicerConfiguration;
 
 namespace MatterHackers.MatterControl.PrinterCommunication.Io
 {
@@ -37,12 +38,24 @@ namespace MatterHackers.MatterControl.PrinterCommunication.Io
 		protected PrinterMove lastDestination = new PrinterMove();
 		public PrinterMove LastDestination { get { return lastDestination; } }
 
+		private EventHandler unregisterEvents;
+
 		public FeedRateMultiplyerStream(GCodeStream internalStream)
 			: base(internalStream)
 		{
+			this.FeedRateRatio = ActiveSliceSettings.Instance.GetValue<double>(SettingsKey.feedrate_ratio);
+
+			ActiveSliceSettings.SettingChanged.RegisterEvent((s, e) =>
+			{
+				var eventArgs = e as StringEventArgs;
+				if (eventArgs?.Data == SettingsKey.feedrate_ratio)
+				{
+					this.FeedRateRatio  = ActiveSliceSettings.Instance.GetValue<double>(SettingsKey.feedrate_ratio);
+				}
+			}, ref unregisterEvents);
 		}
 
-		public double FeedRateRatio { get; set; } = 1;
+		public double FeedRateRatio { get; set; }
 
 		public override void SetPrinterPosition(PrinterMove position)
 		{
@@ -69,5 +82,11 @@ namespace MatterHackers.MatterControl.PrinterCommunication.Io
 
 			return lineToSend;
 		}
+
+		public override void Dispose()
+		{
+			unregisterEvents?.Invoke(null, null);
+			base.Dispose();
+		}
 	}
 }
\ No newline at end of file
diff --git a/PrinterCommunication/Io/GCodeFileStream.cs b/PrinterCommunication/Io/GCodeFileStream.cs
index 14698bfbd..f1bed7473 100644
--- a/PrinterCommunication/Io/GCodeFileStream.cs
+++ b/PrinterCommunication/Io/GCodeFileStream.cs
@@ -27,40 +27,41 @@ of the authors and should not be interpreted as representing official policies,
 either expressed or implied, of the FreeBSD Project.
 */
 
+using System;
 using MatterHackers.GCodeVisualizer;
 using MatterHackers.VectorMath;
 
 namespace MatterHackers.MatterControl.PrinterCommunication.Io
 {
-    public class GCodeFileStream : GCodeStream
-    {
-        public GCodeFile FileStreaming { get; private set; }
-        private int printerCommandQueueLineIndex = -1;
+	public class GCodeFileStream : GCodeStream
+	{
+		public GCodeFile FileStreaming { get; private set; }
+		private int printerCommandQueueLineIndex = -1;
 
-        public GCodeFileStream(GCodeFile fileStreaming, int startLine = 0)
-        {
-            this.FileStreaming = fileStreaming;
-            printerCommandQueueLineIndex = startLine;
-        }
+		public GCodeFileStream(GCodeFile fileStreaming, int startLine = 0)
+		{
+			this.FileStreaming = fileStreaming;
+			printerCommandQueueLineIndex = startLine;
+		}
 
-        public int LineIndex { get { return printerCommandQueueLineIndex; } }
+		public int LineIndex { get { return printerCommandQueueLineIndex; } }
 
-        public override void Dispose()
-        {
-        }
+		public override void Dispose()
+		{
+		}
 
-        public override string ReadLine()
-        {
-            if (printerCommandQueueLineIndex < FileStreaming.LineCount)
-            {
-                return FileStreaming.Instruction(printerCommandQueueLineIndex++).Line;
-            }
+		public override string ReadLine()
+		{
+			if (printerCommandQueueLineIndex < FileStreaming.LineCount)
+			{
+				return FileStreaming.Instruction(printerCommandQueueLineIndex++).Line;
+			}
 
-            return null;
-        }
+			return null;
+		}
 
-        public override void SetPrinterPosition(PrinterMove position)
-        {
-        }
-    }
+		public override void SetPrinterPosition(PrinterMove position)
+		{
+		}
+	}
 }
\ No newline at end of file
diff --git a/Tests/MatterControl.Tests/MatterControl/GCodeStreamTests.cs b/Tests/MatterControl.Tests/MatterControl/GCodeStreamTests.cs
index 039ada2db..96c5af79d 100644
--- a/Tests/MatterControl.Tests/MatterControl/GCodeStreamTests.cs
+++ b/Tests/MatterControl.Tests/MatterControl/GCodeStreamTests.cs
@@ -31,6 +31,7 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using MatterHackers.Agg;
 using MatterHackers.Agg.PlatformAbstract;
+using MatterHackers.GCodeVisualizer;
 using MatterHackers.MatterControl.PrinterCommunication.Io;
 using MatterHackers.MatterControl.SlicerConfiguration;
 using MatterHackers.MatterControl.Tests.Automation;
@@ -40,7 +41,7 @@ using NUnit.Framework;
 namespace MatterControl.Tests.MatterControl
 {
 	[TestFixture]
-	public class GCodeMaxLengthStreamTests
+	public class GCodeStreamTests
 	{
 		[Test, Category("GCodeStream")]
 		public void MaxLengthStreamTests()
@@ -417,6 +418,36 @@ namespace MatterControl.Tests.MatterControl
 				Assert.AreEqual(expectedLine, actualLine, "Unexpected response from PauseHandlingStream");
 			}
 		}
+
+		[Test, Category("GCodeStream")]
+		public void FeedRateStreamTracksSettings()
+		{
+			StaticData.Instance = new FileSystemStaticData(TestContext.CurrentContext.ResolveProjectPath(4, "StaticData"));
+			MatterControlUtilities.OverrideAppDataLocation(TestContext.CurrentContext.ResolveProjectPath(4));
+
+			var gcodeStream = new FeedRateMultiplyerStream(new TestGCodeStream(new string[0]));
+
+			Assert.AreEqual(1, gcodeStream.FeedRateRatio, "FeedRateRatio should default to 1");
+
+			ActiveSliceSettings.Instance.SetValue(SettingsKey.feedrate_ratio, "0.3");
+
+			Assert.AreEqual(0.3, gcodeStream.FeedRateRatio, "FeedRateRatio should remain synced with PrinterSettings");
+		}
+
+		[Test, Category("GCodeStream")]
+		public void ExtrusionRateStreamTracksSettings()
+		{
+			StaticData.Instance = new FileSystemStaticData(TestContext.CurrentContext.ResolveProjectPath(4, "StaticData"));
+			MatterControlUtilities.OverrideAppDataLocation(TestContext.CurrentContext.ResolveProjectPath(4));
+
+			var gcodeStream = new ExtrusionMultiplyerStream(new TestGCodeStream(new string[0]));
+
+			Assert.AreEqual(1, gcodeStream.ExtrusionRatio, "ExtrusionRatio should default to 1");
+
+			ActiveSliceSettings.Instance.SetValue(SettingsKey.extrusion_ratio, "0.3");
+
+			Assert.AreEqual(0.3, gcodeStream.ExtrusionRatio, "ExtrusionRatio should remain synced with PrinterSettings");
+		}
 	}
 
 	public class TestGCodeStream : GCodeStream