When you get to hubs you might give some thought to flanges. They'd be handy for timing gears and other belt drives.
After a 7 month wait my 3D printer (Printrbot+) kit just arrived, with luck work will let me start on it in a couple days. Hope to be printing GM designed gears (not to mention other stuff) with it real soon now.
Some day I may get my own 3d printer working
Maybe you could start with a reprap like a MendelMax to get some experienc
e/have some fun, then continue with your own design. I don't recommend Kickstart
er for a first printer unless you're willing to wait way more than you expected
Looking forwards to another Season of Amazing Things for GM.