By adding materials layer by layer using digital data from a 3D model, companies can now print miniature jet engines, engine parts, turbine engines, ultrasound transducers, pump impellers, and appliances. Even items such as clothing, pottery, shoes, eyewear, orthopedic implants, and some food products can be produced using additive-manufacturing techniques. In 2017, GE Aviation revealed it had used additive manufacturing to create a helicopter engine with 16 parts instead of 900.