Meet the BodyPrinter: a robotic circuit printer that can fabricate them right on the human skin to turn body parts smart. This wearable machine prints flexible electronics with skin-safe conductive ink. It is made with stepper motors, geared DC motor, Arduino with a CNC shield, and an ink syringe. The below video shows the BodyPrinter in action:
These flexible circuits can be used for flex and contact sensing, removing the need to use a separate electronic device for tracking.