diff --git a/cura/PrinterOutput/NetworkedPrinterOutputDevice.py b/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
index 86da9bf57f..e23341ba8a 100644
--- a/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
+++ b/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
@@ -60,8 +60,8 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
         self._gcode = []                    # type: List[str]
         self._connection_state_before_timeout = None    # type: Optional[ConnectionState]
 
-    def requestWrite(self, nodes: List[SceneNode], file_name: Optional[str] = None, limit_mimetypes: bool = False,
-                     file_handler: Optional[FileHandler] = None, **kwargs: str) -> None:
+    def requestWrite(self, nodes: List["SceneNode"], file_name: Optional[str] = None, limit_mimetypes: bool = False,
+                     file_handler: Optional["FileHandler"] = None, filter_by_machine: bool = False, **kwargs) -> None:
         raise NotImplementedError("requestWrite needs to be implemented")
 
     def setAuthenticationState(self, authentication_state: AuthState) -> None:
diff --git a/cura/PrinterOutput/PrinterOutputDevice.py b/cura/PrinterOutput/PrinterOutputDevice.py
index 8e1b220a86..d4a37b3d68 100644
--- a/cura/PrinterOutput/PrinterOutputDevice.py
+++ b/cura/PrinterOutput/PrinterOutputDevice.py
@@ -144,7 +144,7 @@ class PrinterOutputDevice(QObject, OutputDevice):
         return None
 
     def requestWrite(self, nodes: List["SceneNode"], file_name: Optional[str] = None, limit_mimetypes: bool = False,
-                     file_handler: Optional["FileHandler"] = None, **kwargs: str) -> None:
+                     file_handler: Optional["FileHandler"] = None, filter_by_machine: bool = False, **kwargs) -> None:
         raise NotImplementedError("requestWrite needs to be implemented")
 
     @pyqtProperty(QObject, notify = printersChanged)
diff --git a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
index 8d94f41ea5..fc2cdae563 100644
--- a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
+++ b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
@@ -171,8 +171,8 @@ class CloudOutputDevice(NetworkedPrinterOutputDevice):
         self.setConnectionText(I18N_CATALOG.i18nc("@info:status", "Connected via Cloud"))
 
     ##  Called when Cura requests an output device to receive a (G-code) file.
-    def requestWrite(self, nodes: List[SceneNode], file_name: Optional[str] = None, limit_mimetypes: bool = False,
-                     file_handler: Optional[FileHandler] = None, **kwargs: str) -> None:
+    def requestWrite(self, nodes: List["SceneNode"], file_name: Optional[str] = None, limit_mimetypes: bool = False,
+                     file_handler: Optional["FileHandler"] = None, filter_by_machine: bool = False, **kwargs) -> None:
 
         # Show an error message if we're already sending a job.
         if self._progress.visible:
diff --git a/plugins/UM3NetworkPrinting/src/ClusterUM3OutputDevice.py b/plugins/UM3NetworkPrinting/src/ClusterUM3OutputDevice.py
index 5344fe2021..177836bccd 100644
--- a/plugins/UM3NetworkPrinting/src/ClusterUM3OutputDevice.py
+++ b/plugins/UM3NetworkPrinting/src/ClusterUM3OutputDevice.py
@@ -106,8 +106,8 @@ class ClusterUM3OutputDevice(NetworkedPrinterOutputDevice):
 
         self._active_camera_url = QUrl()  # type: QUrl
 
-    def requestWrite(self, nodes: List[SceneNode], file_name: Optional[str] = None, limit_mimetypes: bool = False,
-                     file_handler: Optional[FileHandler] = None, **kwargs: str) -> None:
+    def requestWrite(self, nodes: List["SceneNode"], file_name: Optional[str] = None, limit_mimetypes: bool = False,
+                     file_handler: Optional["FileHandler"] = None, filter_by_machine: bool = False, **kwargs) -> None:
         self.writeStarted.emit(self)
 
         self.sendMaterialProfiles()
diff --git a/plugins/UM3NetworkPrinting/src/LegacyUM3OutputDevice.py b/plugins/UM3NetworkPrinting/src/LegacyUM3OutputDevice.py
index 5c1948b977..7d759264e5 100644
--- a/plugins/UM3NetworkPrinting/src/LegacyUM3OutputDevice.py
+++ b/plugins/UM3NetworkPrinting/src/LegacyUM3OutputDevice.py
@@ -178,7 +178,8 @@ class LegacyUM3OutputDevice(NetworkedPrinterOutputDevice):
                 # NotImplementedError. We can simply ignore these.
                 pass
 
-    def requestWrite(self, nodes: List[SceneNode], file_name: Optional[str] = None, limit_mimetypes: bool = False, file_handler: Optional[FileHandler] = None, **kwargs: str) -> None:
+    def requestWrite(self, nodes: List["SceneNode"], file_name: Optional[str] = None, limit_mimetypes: bool = False,
+                     file_handler: Optional["FileHandler"] = None, filter_by_machine: bool = False, **kwargs) -> None:
         if not self.activePrinter:
             # No active printer. Unable to write
             return
diff --git a/plugins/USBPrinting/USBPrinterOutputDevice.py b/plugins/USBPrinting/USBPrinterOutputDevice.py
index 0e2d159ae6..e32e4c8745 100644
--- a/plugins/USBPrinting/USBPrinterOutputDevice.py
+++ b/plugins/USBPrinting/USBPrinterOutputDevice.py
@@ -24,11 +24,15 @@ from queue import Queue
 from serial import Serial, SerialException, SerialTimeoutException
 from threading import Thread, Event
 from time import time
-from typing import Union, Optional, List, cast
+from typing import Union, Optional, List, cast, TYPE_CHECKING
 
 import re
 import functools  # Used for reduce
 
+if TYPE_CHECKING:
+    from UM.FileHandler.FileHandler import FileHandler
+    from UM.Scene.SceneNode import SceneNode
+
 catalog = i18nCatalog("cura")
 
 
@@ -117,14 +121,16 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
     #   \param filter_by_machine Whether to filter MIME types by machine. This
     #   is ignored.
     #   \param kwargs Keyword arguments.
-    def requestWrite(self, nodes, file_name: str = None, filter_by_machine = False, file_handler = None, **kwargs):
+    def requestWrite(self, nodes: List["SceneNode"], file_name: Optional[str] = None, limit_mimetypes: bool = False,
+                     file_handler: Optional["FileHandler"] = None, filter_by_machine: bool = False, **kwargs) -> None:
         if self._is_printing:
             message = Message(text = catalog.i18nc("@message", "A print is still in progress. Cura cannot start another print via USB until the previous print has completed."), title = catalog.i18nc("@message", "Print in Progress"))
             message.show()
             return  # Already printing
         self.writeStarted.emit(self)
         # cancel any ongoing preheat timer before starting a print
-        self._printers[0].getController().stopPreheatTimers()
+        controller = cast(GenericOutputController, self._printers[0].getController())
+        controller.stopPreheatTimers()
 
         CuraApplication.getInstance().getController().setActiveStage("MonitorStage")