I checked the dimensions, the custom SM05 threads, and the fits with the other parts for the custom 3D MOT holder from Hubs. We have previous issues with bad surface quality and bad SM05 threads. As far as I can tell, everything is up to spec (for the one part I checked). Everything fits together and the SM05 threads are good. I marked in the box which part I checked. The surface quality isn't amazing and could out gas a bit more than we would like, but I don't think we can get around it.