At Alexey Volegov's hands a rotating metal planetary chevron gear, a non-separable system that can only be obtained by 3D printing. Printed at UrFU laboratory. Disclaimer: AAAS and EurekAlert!
It works similar to a normal planetary gearbox, with an outer and inner wheel ... containing equally spaced pieces of ferromagnetic steel metal. In [Resetman] demonstration, the flux modulator ...
Aside from a pneumatic gripper, each axis is driven by a stepper motor, with at least a few of these axes being driven through a metal planetary gearbox for extra precision and torque.