Summary

Edit: Added "B" variant - only difference is cutouts for metal headband springs (cutouts are on inner part)

I did a remix of "outer" part to be more tight:

• narrower hole at the bottom (13mm wide, original was 15mm)
• cutouts for headband springs (around screw holes)
• crossbar for better headband grip

Using this remixed outer part, the grip is more precise and headband length setting is more stiffer.

I did a small remix of "inner" part to be more tight:

• narrower hole at the bottom (13mm wide, original was 15mm)

This is RIGHT couple, if you want LEFT couple, just mirror in your slicer ;-)