The square lamp shade parts on this light fitting were cast pot metal but one by one they have disintegrated. I was not able to buy a replacement and didn't want to throw out the whole fitting. This nut is modelled on the original metal one. For reference the threads are just under 28mm OD and pitch is 2mm, drawn as shown rather than standard thread form. I printed it in silver PLA and they seem to be holding up OK despite heat from the LED bulbs. Worst case I might need to re-do in something tougher eg ABS.

Bambu Lab

Bambu X1C

No

No

0.2

15

Make 3 walls to ensure the threads are solid.