'3D-printed' rocket injector performs as well as more expensive, regular one in test-firing

In a follow-up to the news we reported a few weeks ago about NASA beginning test firings of its new "3D-printed" rocket engine injector (actually technically a distinctly different process than printing known as selective laser sintering, or SLS, which involves using a laser to cut stuff out of metal powder), NASA this week published a new video showing its most recent progress. As it turns out, some of NASA's SLS rocket injectors survived fully in-tact after 11 different hot-fire tests, where they were exposed to temps up to 6,000-degrees Fahrenheit. That's pretty amazing considering that at $5,000 a piece, they were half as expensive than the traditionally manufactured, nuts and bolts injector. They also took way less time to build, at just 40 hours from start to finish. But you just came here to see the video and pics of the test firing, didn't you? Have at it: