Around 2014 Youbinoics announced about their Prosthetic hand which received quite an attention, and now it is here for just €1,200 and not €20,000, thanks to 3D Printers. It comes with flexing the finger and carpus tendons will trigger the hand and fingers to activate and Arduino microprocessor equipped.

Source: https://all3dp.com/new-youbionic-prosthetic-costs-e1200/