diff --git a/plugins/UM3NetworkPrinting/SendMaterialJob.py b/plugins/UM3NetworkPrinting/SendMaterialJob.py
index 19b7598bef..fb4d451097 100644
--- a/plugins/UM3NetworkPrinting/SendMaterialJob.py
+++ b/plugins/UM3NetworkPrinting/SendMaterialJob.py
@@ -28,9 +28,17 @@ class SendMaterialJob(Job):
                 continue
             _, file_name = os.path.split(file_path)
             Logger.log("d", "Syncing material profile with printer: {file_name}".format(file_name = file_name))
+
             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=\"filename\"", file_name.encode("utf-8"), "text/plain"))
 
+            without_extension, _ = os.path.splitext(file_path)
+            signature_file_path = without_extension + ".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()))
+
             self.device.postFormWithParts(target = "/materials", parts = parts)
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