So a while back I made a CAD (computer aided design) using a program called Autodesk Inventor. The result? A 7in x 7in x 7in 3D Companion cube!
This is from the game Portal for those of you who do not know. The interior is a honey come structure to save plastic. Basically how the 3D printing process goes is that the 3D printer lays down a thin strand of plastic at a time, and puts down layer after layer until you get the final object ^_^