Aaron Smith for CNN:  Ford (F) figures they will be lighter than their metal counterparts, and therefore more fuel efficient.

The company will start with spoilers, those streamlined decorations fastened to car exteriors to make them look faster. For now, the company is testing parts for its Ford Performance race car division, but 3D-printed parts could be used for mass-market cars and trucks in the future.

Ford released photos of 3D-printed parts, like the plastic molding for car interiors. The company hinted that it might one day be able to 3D-print more complicated parts, like intake manifolds. Cont'd...