A basic T2 inner mount converter to M42 bayonet. Bought a Beroflex 300mm lens from a flea market that had an incomplete mount (see photo), so I decided to print out a mount adapter for the inner thread. I am a begginer in both photography and printing, so the focal distance might be messed up, if it is, feel free to remix this thing and let me know what you think!

I am yet to print this, so I am not sure about the need for supports.