Technology

SO101

SO101 is an open-source, 3D-printable 6-DOF robotic arm built for affordable, hands-on AI and imitation learning research.

The SO101 (also known as the SO-ARM101) lowers the barrier to entry for embodied AI by providing a highly accessible, community-driven hardware platform. Built with 3D-printed components and six high-torque Feetech STS3215 magnetic encoder servos, this 6-axis robotic arm costs roughly $150 to assemble from scratch. It integrates natively with the Hugging Face LeRobot ecosystem, allowing developers, researchers, and students to calibrate the hardware, record demonstration data, and train imitation learning models (such as Action Chunking Transformers) in a single afternoon.

https://github.com/TheRobotStudio/SO-ARM100

What builders pair with SO101

Projects using both technologies. Select a pairing to see a project.

Built with SO101

Action Chunking (ACT) 1 shared project Algorithm 1 shared project Chunking 1 shared project Hardware 1 shared project Hugging Face 1 shared project Imitation Learning 1 shared project

5 more pairings

LeRobot 1 shared project policy training 1 shared project Robotic Arm 1 shared project Transformers 1 shared project Transformers (ACT) 1 shared project

Pairing: Action Chunking (ACT)

Photo from the event — Event photo

Teaching a robot to always win connect four via LeRobot

Berlin · June 17, 2026

view project | view Action Chunking (ACT)

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Teaching a robot to always win connect four via LeRobot

LeRobot Hugging Face