Lens cap for 52 mm screw, desgined for M42 beroflex 28mm f/2.8.
thingiverse
Screwing cap for beroflex 28mm f/2.8 m42 lens. With a leading rim to hit the screw precisely. Comes with a extra beroflex logo for glueing to the front. (CA glue worked for me with PETG) Might work with other lenses with long enough straight front part.
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