Popular Mechanics has an article on a new 3d printer that can use carbon fiber - New 3D Printer by MarkForged Can Print With Carbon Fiber.
Gregory Mark co-owns Aeromotions, which builds computer-controlled racecar wings. To make those wings both strong and lightweight, they use carbon fiber. No surprise there—it's the material of choice for many advanced motorsports parts. The problem is that making custom racecar parts out of carbon fiber is daunting. The only real method available is the expensive and difficult process of laying up carbon fiber pieces by hand.
To improve the process, Mark looked to 3D printing. But nothing on the market could print the material, and no available materials could print pieces strong enough for his purposes. So Mark devised his own solution: the MarkForged Mark One, the world's first carbon fiber 3D printer.
Mark debuted his Boston area-based startup MarkForged at SolidWorks World 2014 in San Diego with a working prototype. The Mark One can print in carbon fiber, fiberglass, nylon and PLA (a thermoplastic).