NASA has moved a step closer to developing a rocket engine built with 3D printing technology. Recently a team at the space agency’s Marshall Spaceflight Center tested what they called a “breadboard engine” made with 75 percent 3D-printed parts. A breadboard engine is too large to actually propel a rocket, being large enough for engineers to examine its components before and after a test firing.rocket parts printed with 3d printer

The tests took place in October 2015 and were the first time a turbopump, which feeds the combustion chamber, and the injector had been tested together. Both of them had already been tested separately. Seven tests were conducted, with the longest being ten seconds. The tests used liquid hydrogen and liquid oxygen, fuels that most rockets today use. The engine experienced the temperature and other conditions that an engine in a rocket would experience.

The advantages of using 3D-printed parts in a rocket include the fact that fewer moving parts can be used, that the parts can be built more quickly than with conventional manufacturing methods, and that the engines can be built in configurations that are impossible without 3D printing.

In the future, NASA plans to build and test 3D-printed rocket engines that use liquid methane and liquid oxygen. Methane is useful as rocket fuel, as it can be manufactured on Mars. Future astronauts will not have to carry all the fuel they need to return to Earth if they use a methane-burning engine.

In the meantime, the space agency is sharing its designs and test results with commercial partners who may be eager to take advantage of them in the designs of their own rocket engines.

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