Mamiya RZ67 PRO II Fine Focus Gear
Version PRO II of the RZ67 features a delicate fine-focus knob that operates through a gear reducer. It is quite fragile and prone to breaking easily, resulting in a grinding sensation while adjusting the camera’s focus. This serves as a replacement for the gear. Printed at the highest quality settings supported by your printer, I used PLA and the “0.08mm Extra Fine” preset on Bambu X1C.
Below is a good guide on how to replace the gear: