handiii is a myoelectric prosthetic hand designed to offer flexibility and choice by using 3D printer for manufacturing parts and smartphone as controller. Myoelectric bionic arms are prosthetics that people who have lost limbs can control intuitively through faint electrical signals (myoelectric) in the muscles, which are measured on the skin remaining on the arm. Ordinarily they are extremely expensive, but with handiii the cost of the materials could be kept under 30,000 yen. Where the conventional prosthetic hand is designed to imitate the human hand, handiii offers an innovative concept by offering a choice of colors and parts to match the environment and feelings of the user, just like a watch or sneakers.