TheRobotStudio · Hugging Face
SO-101
A 3D-printed arm made for LeRobot. The cheapest way to record demos and train a policy on real hardware.
Hobby · Under $1k Build it yourself Open source
List price Checked 2026-10-19
$230 USD
Parts for a leader + follower pair, sourced yourself (about $122 for one arm). Pre-built kits cost more.
Specs and prices change. Confirm with TheRobotStudio · Hugging Face before you buy.
Specifications
- Payload
- —
- Reach
- —
- Repeatability
- —
- Arm weight
- —
- Control rate
- —
- DOF
- 5
- Gripper
- Included
- Joints
- 5 arm joints plus a servo gripper.
- Connection
- USB serial (Feetech STS3215 bus servos)
- Software
- LeRobotPython
— means the maker doesn't publish it. Sources are at the bottom of this page.
Payload ratings are usually best case, near the base. Expect less at full reach.
Pick it if
- You want to start with LeRobot and imitation learning
- You want leader/follower teleop to record demos
- You want to learn how an arm goes together
Trade-offs
- You print and build it, or pay a vendor to
- Hobby servos: light loads, limited precision
- No official payload or reach figures