We've heard of 3D printing being used to manufacture weapons, but in this wonderful clip, the technology is being used to create hope instead. Ever since he saw the hands of his sister, a 3-year-old boy in Maui always felt he was different from others. Born with abnormal defects on one of his hands, he often struggled with the dream of what it would be like to have two instead. A 3D printing company heard of the story recently and decided to provide a custom-built hand completely free. What used to cost thousands in the world of prosthetics now costs pennies on the dollar when it comes to this amazing printing technology.