Jupiter-8 Lens Cap
thingiverse
Simple lens cap for the Jupiter-8 50mm f/2 lens, an old Russian rangefinder lens. You can find the OpenSCAD file on my Bitbucket account so you should be able to adapt the model for any non-threaded lens from this era: https://bitbucket.org/lgironditmetaz/zorki-4k-3d-printed-parts
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