In the past few years, we have covered a bunch of cool projects that involve building robotic third arms for people with disabilities, soldiers, and workers. This 3D Printed Arduino Robotic Third arm can be made at a lower cost. It is a 4DOF robotic upper limb with Arduino microcontroller and electromechanical actuators in its chassis.
Such a device can help disabled people live more independently. It can also hold tools for people. Chenguang Yang’s video shows this low cost robotic limb in action.