Disney is delving into the world of 3D printing

Have you ever been sitting around bored and found yourself trying to get some random household object — a battery, a pen, whatever — to spin around like a top? Disney has taken that idea to a pretty grand extreme. Combining the power of 3D printing and some damned clever physics work, they’ve worked out a way to make just about any shape spin for ages. The idea: if you have near-perfect control of an object’s distribution of mass, you can also control its center of gravity. In other words: if you can pick-and-choose which areas of a semi-solid object are heavier than others, you can make all sorts of weirdly shaped objects spin like a top when they’d otherwise flop right onto the table. Want a spinning teapot? Okay! A nameless “armadillo” action figure that can spin on one finger? Sure! Disney just passes in the 3D model and plugs in their spinning axis of choice, and their algorithms figure out what sections of the model’s internals need to be made hollow (or, in some cases, use a heavier printing material) for optimal balance.