diff --git a/cura/ExtruderManager.py b/cura/ExtruderManager.py
index c8a07a4000..102f7d7fc0 100644
--- a/cura/ExtruderManager.py
+++ b/cura/ExtruderManager.py
@@ -187,19 +187,18 @@ class ExtruderManager(QObject):
 
         container_registry.addContainer(container_stack)
 
-    ##  Generates extruders for a specific machine.
-    def getMachineExtruders(self, machine_definition):
+    ##  Gets extruders for a specific machine.
+    def getMachineExtruders(self, machine_definition_id):
         container_registry = UM.Settings.ContainerRegistry.getInstance()
-        machine_id = machine_definition.getId()
-        if not machine_id in self._extruder_trains:
-            UM.Logger.log("w", "Tried to get the extruder trains for machine %s, which doesn't exist.", machine_id)
+        if not machine_definition_id in self._extruder_trains:
+            UM.Logger.log("w", "Tried to get the extruder trains for machine %s, which doesn't exist.", machine_definition_id)
             return
-        for _,extruder_train_id in self._extruder_trains[machine_id].items():
+        for _,extruder_train_id in self._extruder_trains[machine_definition_id].items():
             extruder_train = container_registry.findContainerStacks(id = extruder_train_id)
             if extruder_train:
                 yield extruder_train[0]
             else:
-                UM.Logger.log("w", "Machine %s refers to an extruder train with ID %s, which doesn't exist.", machine_id, extruder_train_id)
+                UM.Logger.log("w", "Machine %s refers to an extruder train with ID %s, which doesn't exist.", machine_definition_id, extruder_train_id)
 
     ##  Adds the extruders of the currently active machine.
     def _addCurrentMachineExtruders(self):
diff --git a/cura/ExtrudersModel.py b/cura/ExtrudersModel.py
index 60bd60abab..1efc86d9c5 100644
--- a/cura/ExtrudersModel.py
+++ b/cura/ExtrudersModel.py
@@ -51,7 +51,7 @@ class ExtrudersModel(UM.Qt.ListModel.ListModel):
         global_container_stack = UM.Application.getInstance().getGlobalContainerStack()
         if not global_container_stack:
             return #There is no machine to get the extruders of.
-        for index, extruder in enumerate(manager.getMachineExtruders(global_container_stack.getBottom())):
+        for index, extruder in enumerate(manager.getMachineExtruders(global_container_stack.getBottom().getId())):
             material = extruder.findContainer({ "type": "material" })
             colour = material.getMetaDataEntry("color_code", default = "#FFFF00") if material else "#FFFF00"
             item = { #Construct an item with only the relevant information.
diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index 9a3dc3a263..259750d098 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -15,6 +15,7 @@ from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator
 from UM.Settings.Validator import ValidatorState
 
 from cura.OneAtATimeIterator import OneAtATimeIterator
+from cura.ExtruderManager import ExtruderManager
 
 class StartJobResult(IntEnum):
     Finished = 1
@@ -127,6 +128,9 @@ class StartSliceJob(Job):
 
             self._buildGlobalSettingsMessage(stack)
 
+            for extruder_stack in ExtruderManager.getInstance().getMachineExtruders(stack.getBottom().getId()):
+                self._buildExtruderMessage(extruder_stack)
+
             for group in object_groups:
                 group_message = self._slice_message.addRepeatedMessage("object_lists")
                 if group[0].getParent().callDecoration("isGroup"):
@@ -166,6 +170,15 @@ class StartSliceJob(Job):
             Logger.logException("w", "Unable to do token replacement on start/end gcode")
             return str(value).encode("utf-8")
 
+    def _buildExtruderMessage(self, stack):
+        message = self._slice_message.addRepeatedMessage("extruders")
+        message.id = int(stack.getMetaDataEntry("position"))
+        for key in stack.getAllKeys():
+            setting = message.addRepeatedMessage("settings")
+            setting.name = key
+            setting.value = str(stack.getProperty(key, "value")).encode("utf-8")
+            Job.yieldThread()
+
     ##  Sends all global settings to the engine.
     #
     #   The settings are taken from the global stack. This does not include any