17.5 mm subminiature film spool
thingiverse
These are spools for "HIT-Type" Japanese subminiature cameras, made from the 1930s to the 1950s. Specifically, these fit my **Mycro III A**. They fit on both sides - the take-up spool very snugly, the other one is a bit loose in my Mycro, but usable. Nominally, they have 17.5 mm space for the film + backing paper, but in practice, with my printer, that comes out to more something like 17.2 mm. I don't have any original spools or film to compare them to, so I don't know if they would fit the original film. The original film was apparently ten frames of 14x14 mm pictures - with these spools I only get about 8 frames on them (that is, roughly 15 cm or so of film, with 22 cm or so of backing paper). Your mileage my vary.
With this file you will be able to print 17.5 mm subminiature film spool with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on 17.5 mm subminiature film spool.