In the past few years, we have covered plenty of cool robotic arms here. Care to build one on your own? Will Donaldson has shared a guide that shows you how to do just that. It is a 3D printed hand with 8 SG90 servos, springs, Arduino Uno, battery, and a few other components.
You are going to need a 3D printer, PLA/ABS filament, elastic cord, and a few other items to complete this project.