Theese things are mods of this excellent design: https://www.prusaprinters.org/prints/10370-gravity-spoolholder-for-mmu2s

2 versions of clips on which we can screw PC4 (Push to Connect) M6 PTFE fitting.

I don't have CAD software to edit original STEP files then i updated the original STLs using Blender.

The threads were generated with OpenScad before integration in Blender. The scad file is provided.