There’s a wonderful article in the March 10, 2014 issue of People magazine called “A Helping Hand for a Friend” http://www.people.com/people/article/0,,20795392,00.html.
It’s the story of a 17-year-old boy who used plans for a Robohand from www.thingiverse.com and the 3-D printer at his local library to make a prosthetic hand for Matthew Shields, a nine-year-old family friend who was born without fingers on his right hand. Awesome and heartwarming, and way beyond what most librarians think of when they introduce this technology.