diff --git a/plugins/3MFReader/ThreeMFWorkspaceReader.py b/plugins/3MFReader/ThreeMFWorkspaceReader.py
index ee8652839d..0578fd51c3 100755
--- a/plugins/3MFReader/ThreeMFWorkspaceReader.py
+++ b/plugins/3MFReader/ThreeMFWorkspaceReader.py
@@ -49,7 +49,9 @@ _ignored_machine_network_metadata = {
     "removal_warning",
     "group_name",
     "group_size",
-    "connection_type"
+    "connection_type",
+    "capabilities",
+    "octoprint_api_key",
 }  # type: Set[str]
 
 
diff --git a/plugins/3MFWriter/ThreeMFWorkspaceWriter.py b/plugins/3MFWriter/ThreeMFWorkspaceWriter.py
index 7f39d300b7..d6cc6ea159 100644
--- a/plugins/3MFWriter/ThreeMFWorkspaceWriter.py
+++ b/plugins/3MFWriter/ThreeMFWorkspaceWriter.py
@@ -154,7 +154,8 @@ class ThreeMFWorkspaceWriter(WorkspaceWriter):
                 "group_name",
                 "group_size",
                 "connection_type",
-                "octoprint_api_key"
+                "capabilities",
+                "octoprint_api_key",
             }
             serialized_data = container.serialize(ignored_metadata_keys = ignore_keys)