Just a test to see how would it work a printed chain drive system.It works but... because of the "curling" of the filament and the inaccurate assembly of the steps, the chain is too much tensioned to make it move with a nema17 like motor.Thus the results of the test are: needs improvement :-P Sorry for: More pics? http://aubenc.imgur.com/chain__pinions#2Yi6B UPDATE There's people out there making things with this thing, GREAT! So I've make few changes to the code to make it a little bit easier, just a little bit.Basically, now is easier to stack pinions together.I remove the scad file and upload the new version (which is also capable to produce the old parts), I also upload a screenshot from one possible set of pinions and, of course the stl files for this example.Enjoy! Again an UPDATE New scad file (oups!). I had to remove some silly thing I did in previous version but the real reason for this update is the 5mm (hope it's enough) of clearance I added to the system holder to allow assembling thing 5690 by foxdewayne. I didn't need to ream any hole. I've printed ssssloooooowly and with less plastic than it would look like it is necessary.