BRAAAAAAIN! (a brain that prints)

This is thing 1439 except cleaned up, loose floating junk removed, overhangs eliminated, self-support added, hollowed out (to save filament) and fixed up. It prints very cleanly on my Printrbot Simple Maker (the WOOD one- no option for it on the info page!!).

I would use about 10% infill or less and let 'er rip with your favorite filament.

Print both halves and glue together.