The Derby, a dog with an inherent handicap, He was born with a deformity marked by short Forelegs mitten. Could move only on soft surfaces, because hard surfaces cause abrasions to the edges of its members. Try a wheelchair type, but it was not very convenient. The Tara, an employee of the company 3D Systems, He had the idea of creating prostheses printed on 3D printer. With these members, the Derby not only could walk, but to run for first time.