Engineers at NASA found out in the test video above, when they assembled these 3D-printed rocket engine injectors, and put them up against a temperature of over 6,000º F and 20,000 pounds of thrust.
The test of the rocket engine injector, as you can see, was successful, with the machine emerging from its brief run through the fire unscathed. Though printing the whole engine might still be quite a ways off, the successful test of the injectors is still a pretty significant step forwards. NASA points out that this new injector requires only two parts to be manufactured. The old method required 163 individual pieces.