diff --git a/cura/PrinterOutput/Models/ExtruderConfigurationModel.py b/cura/PrinterOutput/Models/ExtruderConfigurationModel.py
index 4cc3e81f56..d54092b8c9 100644
--- a/cura/PrinterOutput/Models/ExtruderConfigurationModel.py
+++ b/cura/PrinterOutput/Models/ExtruderConfigurationModel.py
@@ -13,9 +13,9 @@ class ExtruderConfigurationModel(QObject):
 
     def __init__(self, position: int = -1) -> None:
         super().__init__()
-        self._position = position  # type: int
-        self._material = None  # type: Optional[MaterialOutputModel]
-        self._hotend_id = None  # type: Optional[str]
+        self._position: int = position
+        self._material: Optional[MaterialOutputModel] = None
+        self._hotend_id: Optional[str] = None
 
     def setPosition(self, position: int) -> None:
         self._position = position
diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index ca45cdc4b9..2051ce1b99 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -99,7 +99,7 @@ class MachineManager(QObject):
 
         self._application.getPreferences().addPreference("cura/active_machine", "")
 
-        self._printer_output_devices = []  # type: List[PrinterOutputDevice]
+        self._printer_output_devices: List[PrinterOutputDevice] = []
         self._application.getOutputDeviceManager().outputDevicesChanged.connect(self._onOutputDevicesChanged)
         # There might already be some output devices by the time the signal is connected
         self._onOutputDevicesChanged()
@@ -112,7 +112,7 @@ class MachineManager(QObject):
 
         self._application.callLater(self.setInitialActiveMachine)
 
-        containers = CuraContainerRegistry.getInstance().findInstanceContainers(id = self.activeMaterialId)  # type: List[InstanceContainer]
+        containers: List[InstanceContainer] = CuraContainerRegistry.getInstance().findInstanceContainers(id = self.activeMaterialId)
         if containers:
             containers[0].nameChanged.connect(self._onMaterialNameChanged)