LeRobot SO-101 - 6 Axis Robotic Arm
The SO-ARM101 is an open-source, 3D-printed robotic arm designed for embodied intelligence research. Hardware optimizations address issues like servo power and structural jams, enabling a focus on AI algorithm development. Unlike standard robotic arms, the SO-ARM101 is designed with learning at its core. It can be trained using techniques like imitation learning and reinforcement learning to perform tasks such as object manipulation and motion replication. The entire system—from hardware to software and algorithms—is fully open-source.

Unassembled DIY Robotics Kit
Simultaneously Updated With The Official Hugging Face project
The SO-ARM100 / 101 robotic arm is an official open-source project by Hugging Face. And this kit stay fully synchronized with the project, allowing users to follow the official tutorials and examples directly and experience new features as soon as the project is updated.

6-DOF Robotic Arm, Flexible Motion Space
the robotic arm moves more flexibly and freely with 6-DoF spatial motion, easily performing complex tasks such as grasping and handling

Switch Between Two Hosts Via USB Hub To Share External Devices
The CAM Kit and Jetson Orin Nano Kit equipped with USB hub, allows seamless switching between dual hosts for model training and experiment testing, without repeatedly plugging and unplugging the robotic arm or camera devices, significantly boosting efficiency
Industrial grade USB HUB, Extending 4x USB 3.2 Ports

*for reference only, please refer to the package content for the detailed part list
Excellent User Experience, Designed For Everyone
From DIY enthusiasts to educators and even researchers, everyone can quickly get started with our kits. Whether for simple demonstrations or advanced development, it delivers a stable and smooth user experience
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Academic ResearchIdeal for teaching experiments and research in fields such as robotics, artificial intelligence, and automation. |
Developers/Tech EnthusiastsUsed for algorithm development, product prototyping, and participating in robotics competitions. |
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Educational InstitutionsAn ideal teaching tool for advanced courses like AI programming. |
Experienced Hobbyists
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*for reference only, please refer to the package content for the detailed part list
Comprehensive Tutorial Resources, Community And Ecosystem Support
Comprehensive tutorials covering everything from assembly to real-world applications, enabling users to get started with robotic arm projects from scratch with ease.
The SO-ARM101 robotic arm is backed by the Hugging Face open-source community and enjoys an active developer ecosystem. With our hardware kit, users can quickly get started and collaborate with developers worldwide, jointly contributing to innovative projects.

Outline Dimensions
Leader Robotic Arm

Follower Robotic Arm

* the dimensions above are for reference only and may differ from the actual size.
Community Inspiration
Walk through the whole dev journey with Nikodem Bartnik, using SO-ARM101 to showcase: from hardware assembly and servo control, to training a custom policy and achieving real-time block-picking inference. Follow his hands-on experience to understand every step, troubleshoot potential issues, and explore what’s possible with this open-source robotic arm.
Step-by-Step Assembly Instructions
The follower arm uses 6x STS3215 motors with 1/345 gearing. The leader, however, uses three differently geared motors to make sure it can both sustain its own weight and it can be moved without requiring much force. Which motor is needed for which joint is shown in the table below.
| Leader-Arm Axis | Motor | Gear Ratio |
|---|---|---|
| Base / Shoulder Pan | 1 | 1 / 191 |
| Shoulder Lift | 2 | 1 / 345 |
| Elbow Flex | 3 | 1 / 191 |
| Wrist Flex | 4 | 1 / 147 |
| Wrist Roll | 5 | 1 / 147 |
| Gripper | 6 | 1 / 147 |
To install LeRobot, follow the Installation Guide.
Resources
| LeRobot Documentation | Link |
| LeRobot Installation Guide | Link |
| TheRobotStudio GitHub | Link |
| Getting started with real-world robots | Tutorial |
Parts List
| 3D Printed Parts | |
| STS3215 Servo 7.4V, 1/345 gear (C001) - LERO0002 | x7 |
| STS3215 Servo 7.4V, 1/191 gear (C044) - LERO0003 | x2 |
| STS3215 Servo 7.4V, 1/147 gear (C046) - LERO0004 | x3 |
| Motor Control Board - WVSH0166 | x2 |
| Type C to Type C Cable (2 Meter) - ELC7061-W20 |
x2 |
| Power Supply - 5V 6A - LERO0005 | x2 |
| Table Clamp - LERO0006 | x4 |
Camera Not Included
Want to buy in bulk?
Custom Requirements?
Discussion Forum
Feel free to ask questions, share tips or report issues.







