Put in an option to set the extruder to use for the raft.

PartPreviewWindow/View3D/View3DWidget.cs

@@ -263,7 +263,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
                 GL.MatrixMode(MatrixMode.Modelview);
                 GL.PushMatrix();
-                GL.Translate(new Vector3(centerTop.x, centerTop.y, centerTop.z + 5*scalling));
+                GL.Translate(new Vector3(centerTop.x, centerTop.y, centerTop.z + 20*scalling));
                 GL.Scale(scalling, scalling, scalling);
 
                 RenderMeshToGl.Render(upArrow, RGBA_Bytes.Black, RenderTypes.Shaded);

SlicerConfiguration/SlicerMapping/EngineMappingMatterSlice.cs

@@ -236,6 +236,8 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
             //supportExtruder=1
             new ValuePlusConstant("supportExtruder", "support_material_extruder", -1),
 
+            new ValuePlusConstant("raftExtruder", "raft_extruder", -1),
+
             //supportLineSpacing=2
             new MapItem("supportLineSpacing", "support_material_spacing"),
 

StaticData/PrinterSettings/config.ini

@@ -82,6 +82,7 @@ perimeters = 3
 post_process = 
 print_center = 100,100
 raft_air_gap = .2
+raft_extruder = 0
 raft_extra_distance_around_part = 5
 raft_fan_speed_percent = 100
 raft_layers = 0

StaticData/SliceSettings/Layouts.txt

@@ -122,6 +122,7 @@ Advanced
         raft_air_gap
         raft_layers
         raft_fan_speed_percent
+        raft_extruder
       Brim
         brim_width
     Support Material

StaticData/SliceSettings/Properties.json

@@ -855,6 +855,13 @@
     "DataEditType": "INT",
     "ExtraSettings": ""
   },
+  {
+    "SlicerConfigName": "raft_extruder",
+    "PresentationName": "Raft Extruder",
+    "HelpText": "The index of the extruder to use for the raft. Setting this to 0 will use the support extruder index.",
+    "DataEditType": "INT",
+    "ExtraSettings": ""
+  },
   {
     "SlicerConfigName": "support_material_extrusion_width",
     "PresentationName": "Support Material",