diff --git a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
index 63c11ba484..9314e067a2 100644
--- a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
+++ b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
@@ -3,10 +3,11 @@
 
 from time import time
 import os
-from typing import List, Optional, cast
+from typing import cast, List, Optional, TYPE_CHECKING
 
 from PyQt5.QtCore import QObject, QUrl, pyqtProperty, pyqtSignal, pyqtSlot
 from PyQt5.QtGui import QDesktopServices
+from PyQt5.QtNetwork import QNetworkReply, QNetworkRequest  # Parse errors specific to print job uploading.
 
 from UM import i18nCatalog
 from UM.Backend.Backend import BackendState
@@ -23,6 +24,7 @@ from ..ExportFileJob import ExportFileJob
 from ..UltimakerNetworkedPrinterOutputDevice import UltimakerNetworkedPrinterOutputDevice
 from ..Messages.PrintJobUploadBlockedMessage import PrintJobUploadBlockedMessage
 from ..Messages.PrintJobUploadErrorMessage import PrintJobUploadErrorMessage
+from ..Messages.PrintJobUploadQueueFullMessage import PrintJobUploadQueueFullMessage
 from ..Messages.PrintJobUploadSuccessMessage import PrintJobUploadSuccessMessage
 from ..Models.Http.CloudClusterResponse import CloudClusterResponse
 from ..Models.Http.CloudClusterStatus import CloudClusterStatus
@@ -194,7 +196,7 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
         # The mesh didn't change, let's not upload it to the cloud again.
         # Note that self.writeFinished is called in _onPrintUploadCompleted as well.
         if self._uploaded_print_job:
-            self._api.requestPrint(self.key, self._uploaded_print_job.job_id, self._onPrintUploadCompleted)
+            self._api.requestPrint(self.key, self._uploaded_print_job.job_id, self._onPrintUploadCompleted, self._onPrintUploadSpecificError)
             return
 
         # Export the scene to the correct file type.
@@ -240,7 +242,7 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
         if not print_job:  # It's possible that another print job is requested in the meanwhile, which then fails to upload with an error, which sets self._uploaded_print_job to `None`.
             # TODO: Maybe _onUploadError shouldn't set the _uploaded_print_job to None or we need to prevent such asynchronous cases.
             return  # Prevent a crash.
-        self._api.requestPrint(self.key, print_job.job_id, self._onPrintUploadCompleted)
+        self._api.requestPrint(self.key, print_job.job_id, self._onPrintUploadCompleted, self._onPrintUploadSpecificError)
 
     def _onPrintUploadCompleted(self, response: CloudPrintResponse) -> None:
         """Shows a message when the upload has succeeded
@@ -251,9 +253,23 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
         PrintJobUploadSuccessMessage().show()
         self.writeFinished.emit()
 
-    def _onUploadError(self, message: str = None) -> None:
-        """Displays the given message if uploading the mesh has failed
+    def _onPrintUploadSpecificError(self, reply: "QNetworkReply", _: "QNetworkReply.NetworkError"):
+        """
+        Displays a message when an error occurs specific to uploading print job (i.e. queue is full).
+        """
+        error_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
+        if error_code == 409:
+            PrintJobUploadQueueFullMessage().show()
+        else:
+            PrintJobUploadErrorMessage(I18N_CATALOG.i18nc("@error:send", "Unknown error code when uploading print job: {0}", error_code)).show()
 
+        self._progress.hide()
+        self._uploaded_print_job = None
+        self.writeError.emit()
+
+    def _onUploadError(self, message: str = None) -> None:
+        """
+        Displays the given message if uploading the mesh has failed due to a generic error (i.e. lost connection).
         :param message: The message to display.
         """
         self._progress.hide()