Gear Skull

Remix of Emmetts 5-6 Heart gear
http://www.thingiverse.com/thing:243278
with macounos printable skull
http://www.thingiverse.com/thing:36110

I moved the center hub a little off center to decrease the size of the holes near the face. Some twisting and turning of the skull against the gear cutouts and bam, this was born. It seems to rotate fairly well, myself and my son are pretty happy with it.

It's not as difficult to assemble and the heart as there are no mirrored parts. Just download the assembled STL and you should be able to figure it out. 18 tooth gears go on the larger faces of the hub, 15 tooth gears go on the smaller ones.

Edit
Per request I have added a zip file with each gear in it's own STL file. I also included my modified version of Emmetts Openscad file and Macounos skull, rotated to get the proper gear alignment.