diff --git a/plugins/GCodeReader/FlavorParser.py b/plugins/GCodeReader/FlavorParser.py
index 696b3b180b..5da1a79fb7 100644
--- a/plugins/GCodeReader/FlavorParser.py
+++ b/plugins/GCodeReader/FlavorParser.py
@@ -23,9 +23,9 @@ import numpy
 import math
 import re
 from typing import Dict, List, NamedTuple, Optional, Union
-from collections import namedtuple
 
-Position = NamedTuple("Position", [("x", float), ("y", float), ("z", float), ("f", float), ("e", float)])
+PositionOptional = NamedTuple("Position", [("x", Optional[float]), ("y", Optional[float]), ("z", Optional[float]), ("f", Optional[float]), ("e", Optional[float])])
+Position = NamedTuple("Position", [("x", float), ("y", float), ("z", float), ("f", float), ("e", List[float])])
 
 ##  This parser is intended to interpret the common firmware codes among all the
 #   different flavors
@@ -40,9 +40,9 @@ class FlavorParser:
         self._clearValues()
         self._scene_node = None
         # X, Y, Z position, F feedrate and E extruder values are stored
-        self._position = namedtuple('Position', ['x', 'y', 'z', 'f', 'e'])
+        self._position = Position
         self._is_layers_in_file = False  # Does the Gcode have the layers comment?
-        self._extruder_offsets = {}  # Offsets for multi extruders. key is index, value is [x-offset, y-offset]
+        self._extruder_offsets = {}  # type: Dict[int, List[float]] # Offsets for multi extruders. key is index, value is [x-offset, y-offset]
         self._current_layer_thickness = 0.2  # default
         self._filament_diameter = 2.85       # default
 
@@ -50,10 +50,10 @@ class FlavorParser:
 
     def _clearValues(self) -> None:
         self._extruder_number = 0
-        self._extrusion_length_offset = [0]
+        self._extrusion_length_offset = [0] # type: List[float]
         self._layer_type = LayerPolygon.Inset0Type
         self._layer_number = 0
-        self._previous_z = 0
+        self._previous_z = 0 # type: float
         self._layer_data_builder = LayerDataBuilder.LayerDataBuilder()
         self._is_absolute_positioning = True    # It can be absolute (G90) or relative (G91)
         self._is_absolute_extrusion = True  # It can become absolute (M82, default) or relative (M83)
@@ -77,14 +77,14 @@ class FlavorParser:
     def _getInt(self, line: str, code: str) -> Optional[int]:
         value = self._getValue(line, code)
         try:
-            return int(value)
+            return int(value)   # type: ignore
         except:
             return None
 
     def _getFloat(self, line: str, code: str) -> Optional[float]:
         value = self._getValue(line, code)
         try:
-            return float(value)
+            return float(value) # type: ignore
         except:
             return None
 
@@ -169,7 +169,7 @@ class FlavorParser:
             return 0.35
         return line_width
 
-    def _gCode0(self, position: Position, params: Position, path: List[List[Union[float, int]]]) -> Position:
+    def _gCode0(self, position: Position, params: PositionOptional, path: List[List[Union[float, int]]]) -> Position:
         x, y, z, f, e = position
 
         if self._is_absolute_positioning:
@@ -205,7 +205,7 @@ class FlavorParser:
     _gCode1 = _gCode0
 
     ##  Home the head.
-    def _gCode28(self, position: Position, params: Position, path: List[List[Union[float, int]]]) -> Position:
+    def _gCode28(self, position: Position, params: PositionOptional, path: List[List[Union[float, int]]]) -> Position:
         return self._position(
             params.x if params.x is not None else position.x,
             params.y if params.y is not None else position.y,
@@ -214,20 +214,20 @@ class FlavorParser:
             position.e)
 
     ##  Set the absolute positioning
-    def _gCode90(self, position: Position, params: Position, path: List[List[Union[float, int]]]) -> Position:
+    def _gCode90(self, position: Position, params: PositionOptional, path: List[List[Union[float, int]]]) -> Position:
         self._is_absolute_positioning = True
         self._is_absolute_extrusion = True
         return position
 
     ##  Set the relative positioning
-    def _gCode91(self, position: Position, params: Position, path: List[List[Union[float, int]]]) -> Position:
+    def _gCode91(self, position: Position, params: PositionOptional, path: List[List[Union[float, int]]]) -> Position:
         self._is_absolute_positioning = False
         self._is_absolute_extrusion = False
         return position
 
     ##  Reset the current position to the values specified.
     #   For example: G92 X10 will set the X to 10 without any physical motion.
-    def _gCode92(self, position: Position, params: Position, path: List[List[Union[float, int]]]) -> Position:
+    def _gCode92(self, position: Position, params: PositionOptional, path: List[List[Union[float, int]]]) -> Position:
         if params.e is not None:
             # Sometimes a G92 E0 is introduced in the middle of the GCode so we need to keep those offsets for calculate the line_width
             self._extrusion_length_offset[self._extruder_number] += position.e[self._extruder_number] - params.e
@@ -260,7 +260,7 @@ class FlavorParser:
                     f = float(item[1:]) / 60
                 if item[0] == "E":
                     e = float(item[1:])
-            params = self._position(x, y, z, f, e)
+            params = PositionOptional(x, y, z, f, e)
             return func(position, params, path)
         return position
 
@@ -322,12 +322,13 @@ class FlavorParser:
                                 lifetime=0,
                                 title = catalog.i18nc("@info:title", "G-code Details"))
 
+        assert(self._message is not None) # use for typing purposes
         self._message.setProgress(0)
         self._message.show()
 
         Logger.log("d", "Parsing Gcode...")
 
-        current_position = self._position(0, 0, 0, 0, [0])
+        current_position = Position(0, 0, 0, 0, [0])
         current_path = []
         min_layer_number = 0
         negative_layers = 0