Steven Davies, who is missing an arm, received a free prosthetic from Team Unlimbited e-Nable, and soon became a volunteer for the organization. When Davies learned that there was an 8-year-old-girl from Bristol who also needed prosthetic arm, he saw a chance to pay his good fortune forward: he designed an arm for Isabella, and then drove 200 miles to deliver it to her in person.
Source: Girl Surprised To Receive 3D-Printed Arm From Designer Who Is Also Missing His Left Arm | Bored Panda