Rear lens cap for Berning Robot Royal cameras (M31 breech-lock mount)

Description
Rear lens caps for the Robot Royal lenses seem impossible to find, so I decided to design one. I took inspiration from a vintage Voigtländer rear lens cap made of leather & felt to design this very simple replacement lens cap.Once the part is printed you will need to glue a piece of felt inside the cap (see image).
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