I really liked the lens cap design made by LxO, which had the best fit of the ones I've tried. I wanted to see if I could improve it further, and did the following changes:
If you want to sand this in any way (e.g. the top side that goes against the lens housing) make sure that you get rid of all dust before trying it out on a lens.
Hi! I'm a tinkerer, designer and maker from Sweden. If you like my designs, feel free to leave a comment. :)