“This is a replacement part for the Mamiya 645 Pro(and I think it works with other models to in the lineup) mirror stop. This part is broken in the cameras, or will broke. I can not find any free version of this, so I made one. I hope I could help. I updated the design after printing the first version. Now I hope it does not need any manipulation after the printing.”

This is an updated version that better allows for Infinity focus.

Print with 100% infill, 0.05mm resolution, and PETG or stronger