Engine

3D Printed rocket engine combustion chamber

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Engineers at Marshall Space Flight Center state that “it records the test-firing of a 3D-printed combustion chamber. Researchers are exploring advanced additive manufacturing solutions, introducing higher-performing alloys and refined printing processes.”
We are curious, so from some comments,
3D printed? From what material? How?
What kind of printer? Is there a video of printing this engine?
How does one hemisphere constitute one chamber?

NASA. (2019, June 25). NASA and Virgin Orbit 3D Print Test Rocket Combustion Chamber. NASA.

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