1:1 print as 1:72 scale model or depending on the 3D printer adjustment ratio, Stl files do not need to be processed, just slice them directly. I made the mold parting for a PLA printer(FDM)(render in blue). The Northrop Grumman X-47B is a demonstration unmanned combat aerial vehicle (UCAV) designed for aircraft carrier-based operations. Developed by the American defense technology company Northrop Grumman.