Two startups aim to make carbon-fiber parts more affordable by reinventing how they are made.
Someday, carbon fiber might live up to its hype and make all of our cars and airplanes more lightweight and efficient. Today, though, parts made of the material are very expensive, and are used mainly in race cars, high-end sports cars, and new jetliners. Some entrepreneurs are now betting that the key to making carbon-fiber parts much cheaper and more widely used is 3-D printing technology.
