Michael Guslick, Amateur Gunsmith, Claims To Have Used 3D Printer To Make Functional Semiautomatic AR-15 Rifle At Home (PHOTOS) By Dominique Mosbergen Posted: 08/08/2012 2:03 pm Updated: 08/08/2012 2:34 pm http://www.huffingtonpost.com/2012/08/08/man-3d-printer-rifle_n_1753513.html