Viewpoints
How 3-D printing could disrupt future economy
May 21, 2013
In its next generation of jet engines, General Electric Co. plans to use a new, and possibly revolutionary, technology. In each engine, 19 nozzles will shoot fuel into a combustion chamber, where it mixes with compressed air. Because the fuel must be distributed precisely, the interior of a nozzle is very sophisticated: Elaborate chambers and passageways help curtail emissions, control nitrous-oxide levels and prevent temperature surges. Previously, making each nozzle required welding 20 dispara