This is a Universal Spool Adaptor for the Makergear M2 ( http://www.makergear.com )

Here are a couple of inserts:

Universal: http://www.thingiverse.com/thing:104200
Taulman: http://www.thingiverse.com/thing:55942

I also have a filament guide to compliment this at http://www.thingiverse.com/thing:49937

Update 5/23/2015: Replaced file with a repaired version (previous was non-manifold)

There's really not much too it. Rotate in a way that you think generates the least support and print.