Twelve-year-old Leon McCarthy’s prosthetic hand is seen as he talks to MakerBot CEO Bre Pettis (not pictured) at the new MakerBot store in Boston, Massachusetts November 21, 2013. McCarthy, whose prosthetic hand is made of parts printed from a MakerBot 3D printer, broke a piece of it last week while playing football, so he printed a new finger to repair it. REUTERS/Brian Snyder (UNITED STATES – Tags: SCIENCE TECHNOLOGY BUSINESS SOCIETY) FOR BEST QUALITY IMAGE ALSO SEE: GF2E9C4127U01 – RTX15NH3
