Snake/Chain Desk Toy

I saw a cool desk toy. It consisted of identical joints that alternated axis rotation that moved in interesting ways and made semi-geometric shapes or just chaos. So I decided to create it modifying the joints of the toy robot tool kit.

Version 1 kept here for historical purposes.

Version 2 consisted of turning the pieces 90 degrees so the knob wasn't printing straight up, but this meant shortening the hole. An optional plug was added to fatten it back up.

Version 3 More tweaking

Version 4 works. Use it.