This thing is EXPERIMENTAL!!!! Kinda inspired by a steam train wheel, I have designed this little set of mechanics. I'm still 15 and kind of hate those CAD softwares, so don't blame me if you don't like it, it took me 3 hrs to design and two days to brainstorm...... I have made one, it doesn't work too hot (will take a video later). So think twice before you start your printer. I Look forward to any remixes or makes that works better or any piece of advice. (I really do) https://www.youtube.com/watch?v=Zc22_S4k_uc&feature=youtu.be use the newest version in the zip file for each part (some are V0.1 but some are V0.12/0.11). in the both "FULL" stl file are all the newest parts. (If your printer is more good at printing a (d=8mm) hole than 50 degree overhangs, then use FULL_0.205. Otherwise use FULL_0.204.) (V0.2x not released yet, just put it on first...) How ever you print, you might want to use racks. it's not included either in FULL or in zip file for separate parts (AKA "FINGER_TRAIN.zip"). It in "rack.zip" assemble according the pictures.