Industar 10, 22, 50 collapsing locking lens cap

I wish the Industar collapsing lenses could lock in the collapsed state permitting me to throw my Zorki 4 with the lens in a coat or sweatshirt pocket but always worry about the lens breaking since it moves around if not locked. Fear no more as I made the lens cover that will fit on the barrel of the lens and locks it into place preventing the lens from moving until the lens cover is removed.

This will need to be printed in TPU and may need to be scaled up or down 1 or 2 percent depending on printer settings and filament properties.