Asteroid Vesta-halved and hollowed

youmagine

The STL is quite compact, given you're working in millimeters. Scaling this up by 1200% yields a print roughly the size of an apple. I employed 15% infill density. The original "vesta.stl" file isn't included; it's available from NASA's website shown above. This file is substantial, measuring about 15MB, but you won't need it unless you want to modify something using the SCAD.