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Hugging Face · Hands & Arms

SO-101 Arm (LeRobot)

Available to order

The open-source SO-101 is sold as kits and assembled arms by vendors listed in the official repository, such as Seeed Studio, which shows it in stock.

from US$299SO-ARM101 Pro, one assembled arm (Seeed Studio)

Seeed Studio, excl. tax and shipping; Seeed's servo motor kit (no 3D-printed parts) is USD 249.90. TheRobotStudio's reference bill of materials for a leader + follower pair is approx. USD 229.88 / €226.30 (parts only, self-build).

Checked
27.09.2026Source
Made for
Research & education · Home
Where
Global · EU · US

Overview

A low-cost, open-source 6-DoF arm used in leader–follower pairs to record demonstrations and train policies with Hugging Face LeRobot.

Key specs

Degrees of freedom
6 incl. gripper
Actuators
6× Feetech STS3215 servos per arm
Setup
Leader arm teleoperates the follower arm
Software
Hugging Face LeRobot
License
Apache-2.0

Why it’s in

  • The standard entry kit for imitation learning with LeRobot
  • Parts for a full leader + follower pair cost about €226 (official BOM)
  • Fully open hardware with a large community

What bothers us

  • Hobby-grade bus servos, not an industrial arm
  • Needs 3D printing and assembly unless bought assembled; teleop needs two arms
  • No single official store; build quality depends on the vendor