Dad builds 3D-printed bionic arm for son

After facing an 18-month wait for his son to receive a bionic hand, Callum Miller decided to make his own - with added flashing lights.The Stockton-on-Tees father bought a 3D printer and created nine sets of bionic limbs for his 11-year-old son Jamie."I knew nothing at all about it before we bought the 3D printer," he told Sky News.