GRX-810 is a new metal alloy developed by NASA for 3D printing parts that can withstand the extreme temperatures of rocket engines, allowing affordable printing of high-heat parts. Credit: NASA Host Andres Almeida: In the aviation world, there’s a 3D-printed metal superalloy that can withstand extreme conditions, and another material that can actually “remember” its shape as temperatures change. NASA-led aeronautics research has always been powered by bold ideas.