This is an attempt to create an internally geared bicycle hub, based on the Sturmey Archer A-3 design from 1914. Because the schematics are so old, I am 99.9% sure that copyright has expired and that they are now public domain. It is very alpha quality. I have no way to test making it so I don't know if the files work. I also haven't drawn all the parts; I've run out of time so here is an upload of what I have so far. Theoretically the gears should at least mesh and spin, if you put the axle, the planetary gears and the ring gears together. Why create it then? To test certain questions:This project uses a modified form of the following public domain project: Parametric Involute Spur Gear by Leemon Baird, 2011, http://www.thingiverse.com/thing:5505 Old Sturmey Archer hub design schematics can be found here: http://www.sturmey-archerheritage.com/index.php?page=history&type=technic&era=1Cornell University has a great guide to Copyright and the Public Domain, discussing the expiration dates for copyright. It is here: http://copyright.cornell.edu/resources/publicdomain.cfmI have no access to a 3d printer, so I don't know how to make it. However if you did print out this alpha partially-completed set of parts, you should be able to at least put the axle in the middle of the planetaries, and have them fit into the ring gear, and get it to spin. Fully assembling an internal bicycle hub is like assembling a puzzle. You can buy actual old metal hubs off of ebay, and view service manuals on the internet, in order to gain understanding and practice.