Who would have ever thought that technology and manufacturing would progress to this level?  Apparently NASA 3D printed some parts and actually used them in a test rocket:

Watch a video that puts you in the test stand. This video gives you a blazing view of the one of the first tests of a 3-D printed rocket injector on June 27, 2013, in Test Stand 115 at NASA’s Marshall Space Flight Center in Huntsville, Ala. Propulsion engineers used the tests to compare the performance of a 3-D printed rocket injector to an injector made with multiple parts and traditional welds. During the extreme temperatures and pressures of the hot firing, the 3-D printed part performed as well as the traditionally manufactured part. This test included a 3-D printed liner.

Let’s watch this rocket in action in the video on page 2

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