Archimedean spiral with a nut trap in the middle and a peg on the other end. There are probably many uses for this thing, but what I have in mind is an auto tensioner for the x-axis of my prusa.

I re-implemented the archimedean spiral function from the 2dgraphing library to make it stronger and longer, then added a post on the end and a nut trap in the center for binding it in place.

I don't know where 2dgraphing came from, so if anyone knows anything about it, please let me know and i'll attribute it.