Inventor Stephen Davies was himself born without a left lower arm and never forgot the stigma of the NHS-issue prosthetic he wore as a child. After several years of not using one, [Davies] began looking at designs available on the NHS - only to discover they had barely improved in three decades. More sophisticated bionic arms ... can cost upwards of 30,000. However, having learned how far lighter limbs could be created on a 3D printer, he began to experiment in his garden shed. He has now set up Team UnLimbited, which creates customised 'cool' limbs for children, featuring their choice of colour and pattern. The father of three said, We've done Iron Man designs, Harry Potter, Lego and Spider-Man. The key is making something the child actually wants to wear and feels is cool enough to show their friends. Sometimes children with prosthetics get bullied at school and something like this can make a huge difference to their confidence." The limbs work for children born without a lower arm. When the wearer moves their elbow, the fist closes, enabling objects to be grasped. Each arm costs about 30 to make, and takes a few days to print and assemble. All are made in the shed. Mr Davies - along with his partner ... Drew Murray - never charge the children for the cost of the limbs, and have instead raised their costs through crowdfunding.