If you can fabricate objects accurately then the modeled screws will mate ... except for hex heads, which anchor to a hexagonal prism. tolerance screw tolerance. Determines actual screw thread ...

Get Instant Summarized Text (Gist) NASA's Chandra X-ray Observatory has released 3D models of cosmic objects, including supernova remnants Cas A, G292.0+1.8, Cygnus Loop, and the young star BP Tau ...