Boneheads: Skull Box w/ Brain - via 3DKitbash.com - 3D Printed by Claudiu Octavian

You can tell it was designed with printability in mind. Printed w/o supports, and things got a little rough on the top of the skull. I used PLA for the skull and green transparent PET for the brain. Sliced with Simplify3D, but now , in retrospect, I believe Slic3r would have done a better job as it does supporting bridged behind the top solid layers, whereas Simpify3D goes directly with the top solid layers over the infill. Since I've used a sparse infill, supporting bridges would have helped; hence the rough finish on the skull's top