diff --git a/plugins/CuraEngineBackend/Cura_pb2.py b/plugins/CuraEngineBackend/Cura_pb2.py
index bb0b000541..54ddcaaa51 100644
--- a/plugins/CuraEngineBackend/Cura_pb2.py
+++ b/plugins/CuraEngineBackend/Cura_pb2.py
@@ -1,8 +1,6 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: Cura.proto
 
-import sys
-_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import message as _message
 from google.protobuf import reflection as _reflection
@@ -18,7 +16,8 @@ _sym_db = _symbol_database.Default()
 DESCRIPTOR = _descriptor.FileDescriptor(
   name='Cura.proto',
   package='cura.proto',
-  serialized_pb=_b('\n\nCura.proto\x12\ncura.proto\"X\n\nObjectList\x12#\n\x07objects\x18\x01 \x03(\x0b\x32\x12.cura.proto.Object\x12%\n\x08settings\x18\x02 \x03(\x0b\x32\x13.cura.proto.Setting\"5\n\x05Slice\x12,\n\x0cobject_lists\x18\x01 \x03(\x0b\x32\x16.cura.proto.ObjectList\"o\n\x06Object\x12\n\n\x02id\x18\x01 \x01(\x03\x12\x10\n\x08vertices\x18\x02 \x01(\x0c\x12\x0f\n\x07normals\x18\x03 \x01(\x0c\x12\x0f\n\x07indices\x18\x04 \x01(\x0c\x12%\n\x08settings\x18\x05 \x03(\x0b\x32\x13.cura.proto.Setting\"\x1a\n\x08Progress\x12\x0e\n\x06\x61mount\x18\x01 \x01(\x02\"=\n\x10SlicedObjectList\x12)\n\x07objects\x18\x01 \x03(\x0b\x32\x18.cura.proto.SlicedObject\"=\n\x0cSlicedObject\x12\n\n\x02id\x18\x01 \x01(\x03\x12!\n\x06layers\x18\x02 \x03(\x0b\x32\x11.cura.proto.Layer\"]\n\x05Layer\x12\n\n\x02id\x18\x01 \x01(\x05\x12\x0e\n\x06height\x18\x02 \x01(\x02\x12\x11\n\tthickness\x18\x03 \x01(\x02\x12%\n\x08polygons\x18\x04 \x03(\x0b\x32\x13.cura.proto.Polygon\"\xe1\x01\n\x07Polygon\x12&\n\x04type\x18\x01 \x01(\x0e\x32\x18.cura.proto.Polygon.Type\x12\x0e\n\x06points\x18\x02 \x01(\x0c\x12\x12\n\nline_width\x18\x03 \x01(\x02\"\x89\x01\n\x04Type\x12\x0c\n\x08NoneType\x10\x00\x12\x0e\n\nInset0Type\x10\x01\x12\x0e\n\nInsetXType\x10\x02\x12\x0c\n\x08SkinType\x10\x03\x12\x0f\n\x0bSupportType\x10\x04\x12\r\n\tSkirtType\x10\x05\x12\x0e\n\nInfillType\x10\x06\x12\x15\n\x11SupportInfillType\x10\x07\"&\n\nGCodeLayer\x12\n\n\x02id\x18\x01 \x01(\x03\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\"D\n\x0fObjectPrintTime\x12\n\n\x02id\x18\x01 \x01(\x03\x12\x0c\n\x04time\x18\x02 \x01(\x02\x12\x17\n\x0fmaterial_amount\x18\x03 \x01(\x02\"4\n\x0bSettingList\x12%\n\x08settings\x18\x01 \x03(\x0b\x32\x13.cura.proto.Setting\"&\n\x07Setting\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\x0c\"\x1b\n\x0bGCodePrefix\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\x62\x06proto3')
+  syntax='proto3',
+  serialized_pb=b'\n\nCura.proto\x12\ncura.proto\"X\n\nObjectList\x12#\n\x07objects\x18\x01 \x03(\x0b\x32\x12.cura.proto.Object\x12%\n\x08settings\x18\x02 \x03(\x0b\x32\x13.cura.proto.Setting\"5\n\x05Slice\x12,\n\x0cobject_lists\x18\x01 \x03(\x0b\x32\x16.cura.proto.ObjectList\"o\n\x06Object\x12\n\n\x02id\x18\x01 \x01(\x03\x12\x10\n\x08vertices\x18\x02 \x01(\x0c\x12\x0f\n\x07normals\x18\x03 \x01(\x0c\x12\x0f\n\x07indices\x18\x04 \x01(\x0c\x12%\n\x08settings\x18\x05 \x03(\x0b\x32\x13.cura.proto.Setting\"\x1a\n\x08Progress\x12\x0e\n\x06\x61mount\x18\x01 \x01(\x02\"=\n\x10SlicedObjectList\x12)\n\x07objects\x18\x01 \x03(\x0b\x32\x18.cura.proto.SlicedObject\"=\n\x0cSlicedObject\x12\n\n\x02id\x18\x01 \x01(\x03\x12!\n\x06layers\x18\x02 \x03(\x0b\x32\x11.cura.proto.Layer\"]\n\x05Layer\x12\n\n\x02id\x18\x01 \x01(\x05\x12\x0e\n\x06height\x18\x02 \x01(\x02\x12\x11\n\tthickness\x18\x03 \x01(\x02\x12%\n\x08polygons\x18\x04 \x03(\x0b\x32\x13.cura.proto.Polygon\"\x8e\x02\n\x07Polygon\x12&\n\x04type\x18\x01 \x01(\x0e\x32\x18.cura.proto.Polygon.Type\x12\x0e\n\x06points\x18\x02 \x01(\x0c\x12\x12\n\nline_width\x18\x03 \x01(\x02\"\xb6\x01\n\x04Type\x12\x0c\n\x08NoneType\x10\x00\x12\x0e\n\nInset0Type\x10\x01\x12\x0e\n\nInsetXType\x10\x02\x12\x0c\n\x08SkinType\x10\x03\x12\x0f\n\x0bSupportType\x10\x04\x12\r\n\tSkirtType\x10\x05\x12\x0e\n\nInfillType\x10\x06\x12\x15\n\x11SupportInfillType\x10\x07\x12\x13\n\x0fMoveCombingType\x10\x08\x12\x16\n\x12MoveRetractionType\x10\t\"&\n\nGCodeLayer\x12\n\n\x02id\x18\x01 \x01(\x03\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\"D\n\x0fObjectPrintTime\x12\n\n\x02id\x18\x01 \x01(\x03\x12\x0c\n\x04time\x18\x02 \x01(\x02\x12\x17\n\x0fmaterial_amount\x18\x03 \x01(\x02\"4\n\x0bSettingList\x12%\n\x08settings\x18\x01 \x03(\x0b\x32\x13.cura.proto.Setting\"&\n\x07Setting\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\x0c\"\x1b\n\x0bGCodePrefix\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\x62\x06proto3'
 )
 _sym_db.RegisterFileDescriptor(DESCRIPTOR)
 
@@ -62,11 +61,19 @@ _POLYGON_TYPE = _descriptor.EnumDescriptor(
       name='SupportInfillType', index=7, number=7,
       options=None,
       type=None),
+    _descriptor.EnumValueDescriptor(
+      name='MoveCombingType', index=8, number=8,
+      options=None,
+      type=None),
+    _descriptor.EnumValueDescriptor(
+      name='MoveRetractionType', index=9, number=9,
+      options=None,
+      type=None),
   ],
   containing_type=None,
   options=None,
   serialized_start=622,
-  serialized_end=759,
+  serialized_end=804,
 )
 _sym_db.RegisterEnumDescriptor(_POLYGON_TYPE)
 
@@ -100,6 +107,7 @@ _OBJECTLIST = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
@@ -130,6 +138,7 @@ _SLICE = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
@@ -155,21 +164,21 @@ _OBJECT = _descriptor.Descriptor(
     _descriptor.FieldDescriptor(
       name='vertices', full_name='cura.proto.Object.vertices', index=1,
       number=2, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      has_default_value=False, default_value=b"",
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
       name='normals', full_name='cura.proto.Object.normals', index=2,
       number=3, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      has_default_value=False, default_value=b"",
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
       name='indices', full_name='cura.proto.Object.indices', index=3,
       number=4, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      has_default_value=False, default_value=b"",
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -188,6 +197,7 @@ _OBJECT = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
@@ -218,6 +228,7 @@ _PROGRESS = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
@@ -248,6 +259,7 @@ _SLICEDOBJECTLIST = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
@@ -285,6 +297,7 @@ _SLICEDOBJECT = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
@@ -336,6 +349,7 @@ _LAYER = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
@@ -361,7 +375,7 @@ _POLYGON = _descriptor.Descriptor(
     _descriptor.FieldDescriptor(
       name='points', full_name='cura.proto.Polygon.points', index=1,
       number=2, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      has_default_value=False, default_value=b"",
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -381,11 +395,12 @@ _POLYGON = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
   serialized_start=534,
-  serialized_end=759,
+  serialized_end=804,
 )
 
 
@@ -406,7 +421,7 @@ _GCODELAYER = _descriptor.Descriptor(
     _descriptor.FieldDescriptor(
       name='data', full_name='cura.proto.GCodeLayer.data', index=1,
       number=2, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      has_default_value=False, default_value=b"",
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -418,11 +433,12 @@ _GCODELAYER = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=761,
-  serialized_end=799,
+  serialized_start=806,
+  serialized_end=844,
 )
 
 
@@ -462,11 +478,12 @@ _OBJECTPRINTTIME = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=801,
-  serialized_end=869,
+  serialized_start=846,
+  serialized_end=914,
 )
 
 
@@ -492,11 +509,12 @@ _SETTINGLIST = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=871,
-  serialized_end=923,
+  serialized_start=916,
+  serialized_end=968,
 )
 
 
@@ -510,14 +528,14 @@ _SETTING = _descriptor.Descriptor(
     _descriptor.FieldDescriptor(
       name='name', full_name='cura.proto.Setting.name', index=0,
       number=1, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b("").decode('utf-8'),
+      has_default_value=False, default_value=b"".decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
       name='value', full_name='cura.proto.Setting.value', index=1,
       number=2, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      has_default_value=False, default_value=b"",
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -529,11 +547,12 @@ _SETTING = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=925,
-  serialized_end=963,
+  serialized_start=970,
+  serialized_end=1008,
 )
 
 
@@ -547,7 +566,7 @@ _GCODEPREFIX = _descriptor.Descriptor(
     _descriptor.FieldDescriptor(
       name='data', full_name='cura.proto.GCodePrefix.data', index=0,
       number=2, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b(""),
+      has_default_value=False, default_value=b"",
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -559,11 +578,12 @@ _GCODEPREFIX = _descriptor.Descriptor(
   ],
   options=None,
   is_extendable=False,
+  syntax='proto3',
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=965,
-  serialized_end=992,
+  serialized_start=1010,
+  serialized_end=1037,
 )
 
 _OBJECTLIST.fields_by_name['objects'].message_type = _OBJECT