began to be used in production versions of spaceflight hardware in early 2014, when SpaceX first flew a flight-critical propulsion system assembly on an operational Falcon 9 flight. A number of other 3D-printed spacecraft assemblies have been ground-tested, including high-temperature, high-pressure rocket enginecombustion chambers and the entire mechanical spaceframe and integral propellant tanks for a small satellite. A 3D printed rocket engine successfully launched a rocket to space in 2017, and to orbit in 2018.
History
began to be used in production versions of spaceflight hardware in early 2014. In January of that year, SpaceX first flew a "Falcon 9 rocket with a 3D-printed Main Oxidizer Valve body in one of the nine Merlin 1D engines". The valve is used to control flow of cryogenicliquid oxygen to the engine in a high-pressure, low-temperature, high-vibration physical environment. In 2015–2016, other 3D-printed spacecraft assemblies were ground-tested, including high-temperature, high-pressure rocket engine combustion chambers and the entire mechanical spaceframe and propellant tanks for a small satellite of a few hundred kilograms. In June 2014, Aerojet Rocketdyne announced that they had "manufactured and successfully tested an engine which had been entirely 3D printed." The Baby Banton engine is a thrust engine that runs on LOX/kerosene propellant. By March 2015, AJR had completed a series of hot-fire tests for additively manufactured components for its full-size AR-1booster engine. The new United Launch Alliance Vulcan launch vehicle—with first launch no earlier than 2019—is evaluating 3D printing for over 150 parts: 100 polymer and more than 50 metal parts. By 2017, a 3D printed rocket engine had successfully launched a rocket to space. when on 25 May 2017, an Electron rocket launched to space from New Zealand that was the first to be powered by a main stage rocket "engine made almost entirely using 3D printing." The Electron's first successful orbital launch was on 21 January 2018.
Applications
Rocket engines
The SuperDraco engine that provides launch escape system and propulsive-landing thrust for the Dragon V2 passenger-carrying space capsule is fully printed, and was the first fully printed rocket engine. In particular, the engine combustion chamber is printed of Inconel, an alloy of nickel and iron, using a process of direct metal laser sintering, and operates at a chamber pressure at a very high temperature. The engines are contained in a printed protective nacelle to prevent fault propagation in the event of an engine failure. The SuperDraco engine produces of thrust. The engine completed a full qualification test in May 2014, and is slated to make its first orbital spaceflight in 2018 or 2019. The ability to 3D print the complex parts was key to achieving the low-mass objective of the engine. It is a very complex engine, and it was very difficult to form all the cooling channels, the injector head, and the throttling mechanism.... "to print very high strength advanced alloys... was crucial to being able to create the SuperDraco engine." The rocket engine for the Electronlaunch vehicle is made nearly entirely using 3D printing.
