removing z_offset, adding data to nozzle offsets xyz

issue: MatterHackers/MCCentral#4793
Slightly illogical that z-offset can have different values

MatterControl.Printing/Settings/SettingsHelpers.cs

@@ -173,6 +173,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 			string currentOffsets = printerSettings.GetValue(SettingsKey.extruder_offset);
 			string[] offsets = currentOffsets.Split(',');
 			int count = 0;
+			var zOffset = printerSettings.GetValue<double>(SettingsKey.z_offset);
 			foreach (string offset in offsets)
 			{
 				if (count == extruderIndex)
@@ -180,7 +181,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 					string[] xyz = offset.Split('x');
 					if (xyz.Length == 2)
 					{
-						return new Vector3(double.Parse(xyz[0]), double.Parse(xyz[1]), 0);
+						return new Vector3(double.Parse(xyz[0]), double.Parse(xyz[1]), -zOffset);
 					}
 					else
 					{

MatterControlLib/SlicerConfiguration/SliceSettingsRow.cs

@@ -374,7 +374,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 				}
 			}
 
-			if (validationErrors.Any())
+			if (validationErrors != null && validationErrors.Any())
 			{
 				var errorsPanel = new FlowLayoutWidget(FlowDirection.TopToBottom)
 				{

MatterControlLib/SlicerConfiguration/SliceSettingsWidget.cs

@@ -740,7 +740,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 
 				case SliceSettingData.DataEditTypes.OFFSET3:
 					placeFieldInDedicatedRow = true;
-					uiField = new ExtruderOffsetField(settingsContext, settingData.SlicerConfigName, theme.TextColor, theme);
+					uiField = new ExtruderOffsetField(printer, settingsContext, settingData.SlicerConfigName, theme.TextColor, theme);
 					break;
 #if !__ANDROID__
 				case SliceSettingData.DataEditTypes.IP_LIST:

MatterControlLib/SlicerConfiguration/UIFields/ExtruderOffsetField.cs

@@ -42,11 +42,13 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 		private Color textColor;
 		private ThemeConfig theme;
 		private string slicerConfigName;
+		PrinterConfig printer;
 
 		private List<Vector3Field> childFields;
 
-		public ExtruderOffsetField(SettingsContext settingsContext, string slicerConfigName, Color textColor, ThemeConfig theme)
+		public ExtruderOffsetField(PrinterConfig printer, SettingsContext settingsContext, string slicerConfigName, Color textColor, ThemeConfig theme)
 		{
+			this.printer = printer;
 			this.slicerConfigName = slicerConfigName;
 			this.settingsContext = settingsContext;
 			this.textColor = textColor;
@@ -111,6 +113,33 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 			base.Initialize(tabIndex);
 		}
 
+		protected override string ConvertValue(string newValue)
+		{
+			var offsets = newValue?.Split(',');
+			string corrected = "";
+			bool first = true;
+			foreach (string offset in offsets)
+			{
+				if(!first)
+				{
+					corrected += ",";
+				}
+				string[] xyz = offset.Split('x');
+				if (xyz.Length == 2)
+				{
+					var zOffset = printer.Settings.GetValue<double>(SettingsKey.z_offset);
+					corrected += xyz[0] + "x" + xyz[1] + "x" + (-zOffset).ToString();
+				}
+				else
+				{
+					corrected += offset;
+				}
+				first = false;
+			}
+
+			return corrected;
+		}
+
 		protected override void OnValueChanged(FieldChangedEventArgs fieldChangedEventArgs)
 		{
 			var segments = this.Value.Split(',');

StaticData/SliceSettings/Layouts.txt

@@ -138,7 +138,6 @@ Printer
         bed_size
         print_center
         build_height
-        z_offset
         bed_shape
     Extruders
       Extruders