diff --git a/cura/PrinterOutput/NetworkedPrinterOutputDevice.py b/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
index 5f5bcf7935..df2675e83f 100644
--- a/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
+++ b/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
@@ -161,7 +161,7 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
         request.setHeader(QNetworkRequest.UserAgentHeader, self._user_agent)
         return request
 
-    def _createFormPart(self, content_header, data, content_type = None) -> QHttpPart:
+    def createFormPart(self, content_header, data, content_type = None) -> QHttpPart:
         part = QHttpPart()
 
         if not content_header.startswith("form-data;"):
diff --git a/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py b/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py
index 51ba159990..0c3febc997 100644
--- a/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py
+++ b/plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py
@@ -217,10 +217,10 @@ class ClusterUM3OutputDevice(NetworkedPrinterOutputDevice):
         # If a specific printer was selected, it should be printed with that machine.
         if target_printer:
             target_printer = self._printer_uuid_to_unique_name_mapping[target_printer]
-            parts.append(self._createFormPart("name=require_printer_name", bytes(target_printer, "utf-8"), "text/plain"))
+            parts.append(self.createFormPart("name=require_printer_name", bytes(target_printer, "utf-8"), "text/plain"))
 
         # Add user name to the print_job
-        parts.append(self._createFormPart("name=owner", bytes(self._getUserName(), "utf-8"), "text/plain"))
+        parts.append(self.createFormPart("name=owner", bytes(self._getUserName(), "utf-8"), "text/plain"))
 
         file_name = Application.getInstance().getPrintInformation().jobName + "." + preferred_format["extension"]
 
@@ -228,7 +228,7 @@ class ClusterUM3OutputDevice(NetworkedPrinterOutputDevice):
         if isinstance(stream, io.StringIO):
             output = output.encode("utf-8")
 
-        parts.append(self._createFormPart("name=\"file\"; filename=\"%s\"" % file_name, output))
+        parts.append(self.createFormPart("name=\"file\"; filename=\"%s\"" % file_name, output))
 
         self._latest_reply_handler = self.postFormWithParts("print_jobs/", parts, onFinished=self._onPostPrintJobFinished, onProgress=self._onUploadPrintJobProgress)
 
diff --git a/plugins/UM3NetworkPrinting/SendMaterialJob.py b/plugins/UM3NetworkPrinting/SendMaterialJob.py
index 2dbfc5f164..230f579b34 100644
--- a/plugins/UM3NetworkPrinting/SendMaterialJob.py
+++ b/plugins/UM3NetworkPrinting/SendMaterialJob.py
@@ -83,12 +83,12 @@ class SendMaterialJob(Job):
 
             parts = []
             with open(file_path, "rb") as f:
-                parts.append(self.device._createFormPart("name=\"file\"; filename=\"{file_name}\"".format(file_name = file_name), f.read()))
+                parts.append(self.device.createFormPart("name=\"file\"; filename=\"{file_name}\"".format(file_name = file_name), f.read()))
             signature_file_path = file_path + ".sig"
             if os.path.exists(signature_file_path):
                 _, signature_file_name = os.path.split(signature_file_path)
                 with open(signature_file_path, "rb") as f:
-                    parts.append(self.device._createFormPart("name=\"signature_file\"; filename=\"{file_name}\"".format(file_name = signature_file_name), f.read()))
+                    parts.append(self.device.createFormPart("name=\"signature_file\"; filename=\"{file_name}\"".format(file_name = signature_file_name), f.read()))
 
             Logger.log("d", "Syncing material {material_id} with cluster.".format(material_id = material_id))
             self.device.postFormWithParts(target = "materials/", parts = parts, onFinished = self.sendingFinished)