Leon McCarthy was born missing his fingers on his left hand because of restrictive blood flow in the womb. <br /> <br />But with the help of a relatively cheap 3-D printer, and an inventor on the Internet, his father Paul was able to build him a homemade prosthetic hand for a fraction of what a medical one would have cost. <br /> <br />Michelle Miller of CBS Evening News made this enthralling report about Leon, his dad, and his new special hand.
