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Propulsion systems engineer Greg Barnett gets the 3-D rocket injector ready for a hot fire test at NASA's Marshall Space Flight Center in Huntsville, Ala. This particular 9.5-inch injector is about half the size of the one that's expected to be used in NASA's RS-25 engine. It was made with just two pieces whereas a similar injector made with traditional welding has 115 pieces.
Image credit: NASA/MSFC/Emmett Given