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!

Adherents of the subculture are known as gearheads, and [Let’s Print] is among them. His latest creation is a 3D printed planetary gearbox ... from the aptly-named [Gear Down For What].

In those mechanisms, a high-torque, low backlash gearbox might be just the thing, and a 3D printable split planetary harmonic ... as we saw in this 3D-printed strain wave gear.