Scientists at NASA's Jet Propulsion Laboratory make a rocket nozzle using a new 3-D printing technique that allows for multiple metallic properties in the same object.

Scientists make a rocket nozzle using a new 3-D printing technique that allows for multiple metallic properties in the same object. This technique involves blowing multiple metal powders into a laser beam, so that the laser melts the powder and forms a small pool at the point where the laser touches the part that is being built.

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