Parts & Components

Feetech STS series servos

The family used by SO-100, SO-101 and LeKiwi. It is the most commonly chosen option under about USD 20 per unit that offers bus communication and position feedback, and it has become the de facto reference for the low-budget robot ecosystem — a large share of open projects design their structure around its dimensions and protocol.

Blueprints

Blueprints · B

A USD 110 arm: why SO-101 is the one to build first

At the low end this is the most literal use of "open source": you can buy the parts, change the structure and replace …

SO-101 arm · Feetech STS series servos · LeRobot · 2026-09-28

Hardware

Hardware · B

A 20 kg-cm servo: measured under what conditions?

Servos often account for more than half the bill of materials of a desktop robot, and their headline number is the lea…

Feetech STS series servos · SO-101 arm · 2026-09-28