MaverickSawyer
Acolyte of the Probe
NASA has undertaken research into 3D printing the injector heads of rocket engines. The results look promising so far: equal performance at half the manufacturing costs.
http://news.yahoo.com/3d-printed-rocket-parts-excel-nasa-tests-155412871.html
http://news.yahoo.com/3d-printed-rocket-parts-excel-nasa-tests-155412871.html