Rocket engines don’t have moving parts, and no turbine blades.
Suspect the materials and design are altered relative to a traditional process of manufacture of a part fulfilling the design requirements.
Printing usually cuts time-to-availability in exchange for more expensive materials to achieve a functional goal. Some aerospace applications substantially cut time to manufacture and achieved a 10-15% reduction in weight.
The fuel injection nozzle plate for a rocket engine was created in less than 4 months by printing, versus a year plus quote from traditional manufacturing sources.
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