Originally Posted by
matthewd
After I finish this one I will convert it for larger formats and 35mm.
The film advance mechanism is very solid, it consists of 4 parts, the top of the body , knob, the knob washer and the spring. The spring is a torsion spring that fits tightly around the knob and the arm of the spring fits into a slot in the top of the body. So when you advance the film it loosens the spring and allows it move forward, and when you let go it tightens and doesn't allow backwards movement. It allows very tiny adjustment, like factions of a mm, with no backwards movement. This part has been printed and tested when I had access to a 3d printer. You can download the parts here.
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