In the past few years, we have covered plenty of interesting robot arms here. This Sphere Rolling Joint Robot Arm by Skyentific is also worth a look. It has a unique design that enables it to make moves not possible with traditional robot arms. This robot has 4 degrees of freedom. As the maker explains, this approach allows for backlash compensation, better cable management, and parallel configuration.
Must see robots & drones:
Virtual Sphere Rolling Joint Robot Arm (DYNAMIXEL + OpenRB-150)
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