GE produced this video about a working jet engine model that was created through additive manufacturing and run in a GE Aviation test cell. The video briefly documents the manufacturing process that produced in this engine, a process that illustrates at least two significant points related to additive manufacturing. They are:
1. Design freedom. Because it makes parts that machining can’t produce, additive manufacturing offers the opportunity to reengineer parts and assemblies for greater performance. GE’s engineers started with a radio-controlled aircraft engine, but then they improved its components for additive manufacturing. (They also further improved them by making them from high-temperature alloys a radio-controlled engine wouldn’t normally use.)
2. Secondary operations. Additive manufacturing makes intricate parts, but it does not necessarily make finished parts. The video shows this. The parts that were produced additively (on an EOS M270 machine) went on to receive secondary machining and finishing steps. The same will almost certainly be true of any production metal part made through additive manufacturing.