Lara Pincott, 10 with her 3D prosthetic hand - designed and built by hjer school mates. See MASONS story MNHAND: A schoolgirl born with only one hand has been fitted with a new prosthetic - made by her CLASSMATES. Lara Pincott, 10, never wanted a prosthetic hand but changed her mind when she saw brightly-coloured printed hands on TV. Luckily, her technology teacher's husband runs a 3D printing company which provided some printers which can produce a hand for as little as £3. After a project involving the whole school, Lara now has a fully-working prosthetic which is so simple she can even carry out simple repair jobs herself.