Yashica / Bay-1 lens hood

This is a repost of a lens hood originally made by Elad6k, and licensed under cc. The original thing seems to be missing.

This is a solid and nice-looking design. However, it fits on the inner mount of the lens, and I don't know how carefully the hood was calculated to avoid vignetting. I think I will be switching to my own design at this point: https://www.thingiverse.com/thing:6024422