Shared by wjcao on Instructables:

The project is based on circuit playground express and cricket. The concept is to reimagine what will happen if people have one more finger? Will our life become easier or will it cause troubles? The deliverable is a 3d printed finger which is controlled by a servo and the servo will be activated by flex sensor. The idea is inspired by different technologies for disabilities and the devices soldiers can put on in sci-fi movies. In those movies, such as Edge of Tomorrow and Elysium, People like soldiers wear these devices, which can work perfectly with human body motion. In reality, people make artificial limb using different technologies, such as using natural muscle signals (When muscles contract they generate electricity) to enhance the control of hand and arm prosthetics.

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