Growing up without a hand can pose many challenges. There are plenty of advanced prosthetic arms on the market that can make life easier for people but they are not cheap. Bolivian teen Leonardo Viscarra, who grew up without his left hand, has managed to design and build his own prosthesis using a 3D printer. The whole project cost less than $100.
The model was taken from Thingiverse and 3D printed using thermoplastic with nylon threads. This video from Ruptly TV has more on the story.