I am also interested in this (Curt and I seem to share a lot of interests!). This is the only one I’ve found on thingiverse so far: http://www.thingiverse.com/thing:144156. It’s laser cut, but we should be able to do that. The main problem is I’m not sure what to search for. I found this one with a search for “rotational axis”.
Reply To: Laser etch wood dowel ideas needed