Lampshade holder

It's a screw-in lampshade holder, designed for lampshades with a ~82 mm diameter hole.
 

The previous standard holder was too weak to stably hold the quite heavy glass lampshade (diameter ~25 cm).

The lampshade holder elements should be connected with three M3x16 screws (with nuts) not too tight, so as not to damage the lampshade itself.

Due to the possible higher temperature inside the lamp, I used ABS, but PETG should also work.