diff --git a/ActionBar/ActionBarPlus.cs b/ActionBar/ActionBarPlus.cs
index 4bc8e7216..ab8afced3 100644
--- a/ActionBar/ActionBarPlus.cs
+++ b/ActionBar/ActionBarPlus.cs
@@ -61,9 +61,6 @@ namespace MatterHackers.MatterControl
 			}
 			this.AddChild(PrintStatusRow.Create(queueDataView));
 			this.Padding = new BorderDouble(bottom: 6);
-
-			// Add Handlers
-			ActiveTheme.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);
 		}
 
 		public void ThemeChanged(object sender, EventArgs e)
diff --git a/ActionBar/PrintActionRow.cs b/ActionBar/PrintActionRow.cs
index 10759d871..e62925f39 100644
--- a/ActionBar/PrintActionRow.cs
+++ b/ActionBar/PrintActionRow.cs
@@ -289,7 +289,6 @@ namespace MatterHackers.MatterControl.ActionBar
 			cancelConnectButton.Click += (sender, e) => { UiThread.RunOnIdle(CancelPrinting); };
 			reprintButton.Click += onReprintButton_Click;
 			doneWithCurrentPartButton.Click += onDoneWithCurrentPartButton_Click;
-			ActiveTheme.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);
 		}
 
 		protected void DisableActiveButtons()
diff --git a/ActionBar/PrintStatusRow.cs b/ActionBar/PrintStatusRow.cs
index 4ddd3c56a..1b9f115a0 100644
--- a/ActionBar/PrintStatusRow.cs
+++ b/ActionBar/PrintStatusRow.cs
@@ -253,11 +253,6 @@ namespace MatterHackers.MatterControl.ActionBar
 			autoLevelButton.Cursor = Cursors.Hand;
 			autoLevelButton.Visible = ActiveSliceSettings.Instance.GetValue<bool>(SettingsKey.print_leveling_enabled);
 
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent((sender, e) =>
-			{
-				autoLevelButton.Visible = ActiveSliceSettings.Instance.GetValue<bool>(SettingsKey.print_leveling_enabled);
-			}, ref unregisterEvents);
-
 			PrinterSettings.PrintLevelingEnabledChanged.RegisterEvent((sender, e) =>
 			{
 				autoLevelButton.Visible = ActiveSliceSettings.Instance.GetValue<bool>(SettingsKey.print_leveling_enabled);
@@ -692,11 +687,6 @@ namespace MatterHackers.MatterControl.ActionBar
 			autoLevelButton.ToolTipText = "Print leveling is enabled.".Localize();
 			autoLevelButton.Visible = ActiveSliceSettings.Instance.GetValue<bool>(SettingsKey.print_leveling_enabled);
 
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent((sender, e) =>
-			{
-				autoLevelButton.Visible = ActiveSliceSettings.Instance.GetValue<bool>(SettingsKey.print_leveling_enabled);
-			}, ref unregisterEvents);
-
 			PrinterSettings.PrintLevelingEnabledChanged.RegisterEvent((sender, e) =>
 			{
 				autoLevelButton.Visible = ActiveSliceSettings.Instance.GetValue<bool>(SettingsKey.print_leveling_enabled);
diff --git a/ActionBar/PrinterConnectAndSelectControl.cs b/ActionBar/PrinterConnectAndSelectControl.cs
index ade252546..800351cb7 100644
--- a/ActionBar/PrinterConnectAndSelectControl.cs
+++ b/ActionBar/PrinterConnectAndSelectControl.cs
@@ -199,7 +199,6 @@ namespace MatterHackers.MatterControl.ActionBar
 			// Bind connect button states to active printer state
 			this.SetConnectionButtonVisibleState();
 
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent(onActivePrinterChanged, ref unregisterEvents);
 			PrinterConnectionAndCommunication.Instance.EnableChanged.RegisterEvent(onPrinterStatusChanged, ref unregisterEvents);
 			PrinterConnectionAndCommunication.Instance.CommunicationStateChanged.RegisterEvent(onPrinterStatusChanged, ref unregisterEvents);
 		}
@@ -215,12 +214,6 @@ namespace MatterHackers.MatterControl.ActionBar
 			PrinterConnectionAndCommunication.Instance.ConnectToActivePrinter(true);
 		}
 
-		private void onActivePrinterChanged(object sender, EventArgs e)
-		{
-			connectPrinterButton.Enabled = ActiveSliceSettings.Instance.PrinterSelected;
-			editPrinterButton.Enabled = ActiveSliceSettings.Instance.PrinterSelected;
-		}
-
 		private void onConfirmStopPrint(bool messageBoxResponse)
 		{
 			if (messageBoxResponse)
diff --git a/ActionBar/TemperatureWidgetBase.cs b/ActionBar/TemperatureWidgetBase.cs
index 376c124b8..4578e5343 100644
--- a/ActionBar/TemperatureWidgetBase.cs
+++ b/ActionBar/TemperatureWidgetBase.cs
@@ -103,8 +103,6 @@ namespace MatterHackers.MatterControl.ActionBar
 			this.AddChild(currentTempIndicator);
 			this.AddChild(buttonContainer);
 
-			ActiveTheme.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);
-
 			this.MouseEnterBounds += onEnterBounds;
 			this.MouseLeaveBounds += onLeaveBounds;
 			this.preheatButton.Click += onPreheatButtonClick;
diff --git a/ApplicationView/MenuRow/MenuOptionAction.cs b/ApplicationView/MenuRow/MenuOptionAction.cs
index f7ee931cc..edd3f5ca7 100644
--- a/ApplicationView/MenuRow/MenuOptionAction.cs
+++ b/ApplicationView/MenuRow/MenuOptionAction.cs
@@ -20,7 +20,6 @@ namespace MatterHackers.MatterControl
 		{
 			Name = "Actions Menu";
 
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent((s, e) => SetEnabledState(), ref unregisterEvents);
 			PrinterConnectionAndCommunication.Instance.CommunicationStateChanged.RegisterEvent((s,e) => SetEnabledState(), ref unregisterEvents);
 		}
 
diff --git a/ApplicationView/TouchscreenTabView.cs b/ApplicationView/TouchscreenTabView.cs
index bdc777072..da38e7f75 100644
--- a/ApplicationView/TouchscreenTabView.cs
+++ b/ApplicationView/TouchscreenTabView.cs
@@ -202,8 +202,6 @@ namespace MatterHackers.MatterControl
 			QueueData.Instance.ItemAdded.RegisterEvent(NumQueueItemsChanged, ref unregisterEvents);
 			QueueData.Instance.ItemRemoved.RegisterEvent(NumQueueItemsChanged, ref unregisterEvents);
 
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent((s, e) => ApplicationController.Instance.ReloadAdvancedControlsPanel(), ref unregisterEvents);
-
 			PrinterConnectionAndCommunication.Instance.ActivePrintItemChanged.RegisterEvent((s, e) =>
 			{
 				// ReloadPartPreview
diff --git a/CustomWidgets/ExportPrintItemWindow.cs b/CustomWidgets/ExportPrintItemWindow.cs
index b2c165ee4..ab03c58df 100644
--- a/CustomWidgets/ExportPrintItemWindow.cs
+++ b/CustomWidgets/ExportPrintItemWindow.cs
@@ -50,7 +50,6 @@ namespace MatterHackers.MatterControl
 			this.Name = "Export Item Window";
 
 			CreateWindowContent();
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent(ReloadAfterPrinterProfileChanged, ref unregisterEvents);
 			PrinterSettings.PrintLevelingEnabledChanged.RegisterEvent(ReloadAfterPrinterProfileChanged, ref unregisterEvents);
 		}
 
diff --git a/CustomWidgets/PartThumbnailWidget.cs b/CustomWidgets/PartThumbnailWidget.cs
index 47bcebe7a..866ca3025 100644
--- a/CustomWidgets/PartThumbnailWidget.cs
+++ b/CustomWidgets/PartThumbnailWidget.cs
@@ -126,7 +126,6 @@ namespace MatterHackers.MatterControl
 			this.Click += DoOnMouseClick;
 			this.MouseEnterBounds += onEnter;
 			this.MouseLeaveBounds += onExit;
-			ActiveTheme.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);
 		}
 
 		private void DoOnMouseClick(object sender, EventArgs e)
@@ -259,19 +258,6 @@ namespace MatterHackers.MatterControl
 			}
 		}
 
-		public void ThemeChanged(object sender, EventArgs e)
-		{
-			//Set background color to new theme
-			this.normalBackgroundColor = ActiveTheme.Instance.PrimaryAccentColor;
-			this.BackgroundColor = ActiveTheme.Instance.PrimaryAccentColor;
-
-			//Regenerate thumbnails
-			// The thumbnail color is currently white and does not change with this change.
-			// If we eventually change the thumbnail color with the theme we will need to change this.
-			//this.thumbNailHasBeenRequested = false;
-			this.Invalidate();
-		}
-
 		private static ImageBuffer BuildImageFromMeshGroups(List<MeshGroup> loadedMeshGroups, string stlHashCode, Point2D size)
 		{
 			if (loadedMeshGroups != null
diff --git a/CustomWidgets/PrintProgressBarWidget.cs b/CustomWidgets/PrintProgressBarWidget.cs
index f6716ee30..0a629b67f 100644
--- a/CustomWidgets/PrintProgressBarWidget.cs
+++ b/CustomWidgets/PrintProgressBarWidget.cs
@@ -133,7 +133,6 @@ namespace MatterHackers.MatterControl
 
 			PrinterConnectionAndCommunication.Instance.ActivePrintItemChanged.RegisterEvent(Instance_PrintItemChanged, ref unregisterEvents);
 			PrinterConnectionAndCommunication.Instance.CommunicationStateChanged.RegisterEvent(Instance_PrintItemChanged, ref unregisterEvents);
-			ActiveTheme.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);
 
 			SetThemedColors();
 			UpdatePrintStatus();
diff --git a/History/PrintHistoryListItem.cs b/History/PrintHistoryListItem.cs
index 9841bc712..e4b506316 100644
--- a/History/PrintHistoryListItem.cs
+++ b/History/PrintHistoryListItem.cs
@@ -304,7 +304,6 @@ namespace MatterHackers.MatterControl.PrintHistory
 
 		private void AddHandlers()
 		{
-			ActiveTheme.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);
 			MouseEnterBounds += new EventHandler(HistoryItem_MouseEnterBounds);
 			MouseLeaveBounds += new EventHandler(HistoryItem_MouseLeaveBounds);
 		}
diff --git a/PartPreviewWindow/BaseClasses/PartPreview3DWidget.cs b/PartPreviewWindow/BaseClasses/PartPreview3DWidget.cs
index f7342955c..61f446c7f 100644
--- a/PartPreviewWindow/BaseClasses/PartPreview3DWidget.cs
+++ b/PartPreviewWindow/BaseClasses/PartPreview3DWidget.cs
@@ -65,11 +65,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 		{
 			ActiveSliceSettings.SettingChanged.RegisterEvent(CheckSettingChanged, ref unregisterEvents);
 			ApplicationController.Instance.AdvancedControlsPanelReloading.RegisterEvent(CheckSettingChanged, ref unregisterEvents);
-#if false
-            "extruder_offset",
-#endif
-
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent((s, e) => needToRecretaeBed = true, ref unregisterEvents);
 		}
 
 		private void CheckSettingChanged(object sender, EventArgs e)
diff --git a/PartPreviewWindow/ViewGcodeBasic.cs b/PartPreviewWindow/ViewGcodeBasic.cs
index c0eddb889..5068aed73 100644
--- a/PartPreviewWindow/ViewGcodeBasic.cs
+++ b/PartPreviewWindow/ViewGcodeBasic.cs
@@ -111,8 +111,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 			ActiveSliceSettings.SettingChanged.RegisterEvent(CheckSettingChanged, ref unregisterEvents);
 			ApplicationController.Instance.AdvancedControlsPanelReloading.RegisterEvent((s, e) => ClearGCode(), ref unregisterEvents);
-
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent(CheckSettingChanged, ref unregisterEvents);
 		}
 
 		private void CheckSettingChanged(object sender, EventArgs e)
diff --git a/Queue/QueueDataWidget.cs b/Queue/QueueDataWidget.cs
index dca5a5519..b4b77b32e 100644
--- a/Queue/QueueDataWidget.cs
+++ b/Queue/QueueDataWidget.cs
@@ -230,14 +230,6 @@ namespace MatterHackers.MatterControl.PrintQueue
 					queueMenu = new QueueOptionsMenu();
 					queueMenuContainer.AddChild(queueMenu.MenuDropList);
 					buttonPanel1.AddChild(queueMenuContainer);
-
-					ActiveSliceSettings.ActivePrinterChanged.RegisterEvent((object sender, EventArgs e) =>
-					{
-						queueMenuContainer.RemoveAllChildren();
-						// the printer changed reload the queueMenue
-						queueMenu = new QueueOptionsMenu();
-						queueMenuContainer.AddChild(queueMenu.MenuDropList);
-					}, ref unregisterEvents);
 				}
 				allControls.AddChild(buttonPanel1);
 			}
diff --git a/Queue/QueueRowItem.cs b/Queue/QueueRowItem.cs
index 34e9980d1..5c391e55c 100644
--- a/Queue/QueueRowItem.cs
+++ b/Queue/QueueRowItem.cs
@@ -266,7 +266,7 @@ namespace MatterHackers.MatterControl.PrintQueue
 
 			this.AddChild(actionButtonContainer);
 
-			AddHandlers();
+			PrintItemWrapper.SlicingOutputMessage += PrintItem_SlicingOutputMessage;
 		}
 
 		public override void OnClosed(EventArgs e)
@@ -396,12 +396,6 @@ namespace MatterHackers.MatterControl.PrintQueue
 			}
 		}
 
-		private void AddHandlers()
-		{
-			ActiveTheme.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);
-			PrintItemWrapper.SlicingOutputMessage += PrintItem_SlicingOutputMessage;
-		}
-
 		private void ExportQueueItemWindow_Closed(object sender, EventArgs e)
 		{
 			this.exportingWindowIsOpen = false;
diff --git a/SlicerConfiguration/SliceSettingsWidget.cs b/SlicerConfiguration/SliceSettingsWidget.cs
index 913487cb8..81cabf353 100644
--- a/SlicerConfiguration/SliceSettingsWidget.cs
+++ b/SlicerConfiguration/SliceSettingsWidget.cs
@@ -205,7 +205,10 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 			}
 
 			pageTopToBottomLayout.AddChild(topCategoryTabs);
-			AddHandlers();
+
+			PrinterConnectionAndCommunication.Instance.CommunicationStateChanged.RegisterEvent(onPrinterStatusChanged, ref unregisterEvents);
+			PrinterConnectionAndCommunication.Instance.EnableChanged.RegisterEvent(onPrinterStatusChanged, ref unregisterEvents);
+
 			SetVisibleControls();
 
 			// Make sure we are on the right tab when we create this view
@@ -281,13 +284,6 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 
 		private event EventHandler unregisterEvents;
 
-		private void AddHandlers()
-		{
-			PrinterConnectionAndCommunication.Instance.CommunicationStateChanged.RegisterEvent(onPrinterStatusChanged, ref unregisterEvents);
-			ActiveSliceSettings.ActivePrinterChanged.RegisterEvent(APP_onPrinterStatusChanged, ref unregisterEvents);
-			PrinterConnectionAndCommunication.Instance.EnableChanged.RegisterEvent(onPrinterStatusChanged, ref unregisterEvents);
-		}
-
 		public override void OnClosed(EventArgs e)
 		{
 			unregisterEvents?.Invoke(this, null);