The most affordable 6-DOF AI robot arm for under $300
Pre-assembled. Open-source. Works with HuggingFace LeRobot out of the box. Train imitation learning policies in an afternoon.
Everything in the box
2 Robot Arms
Leader + follower, fully assembled & tested
12× STS3215 Servos
Bus servos with position feedback, 30 kg·cm torque
Driver Boards & Cables
2× Waveshare boards, USB-C cables, power supplies
LeRobot Compatible
pip install lerobot — calibrate, record, train, deploy
ACT & Diffusion Policy
Train transformer-based imitation learning models
Fully Open Source
Hardware + software. Modify, extend, contribute back
What the community is saying
Building on top of the insanely successful SO-100 (the most popular robot arms ever?), SO-101 are the first robot arms any AI builder should buy.
Apr 28, 2025Meet the game-changer: SO-100 🦾 At 1/3 the cost and 2x the capabilities of our previous arms, it's the most accessible, high-performance robotic arm. Easiest DIY at home!
Oct 1, 2024SO-101 is here! Open-source, affordable, and ready for AI-powered robotics. You better get it ASAP, since there will be a World-wide hackathon based on this awesome arm 🙌
Apr 29, 2025“Why not just 3D print it?”
You absolutely can — the hardware is fully open-source on GitHub. But the DIY route takes 30+ hours: ~24h printing, 2-3 weeks sourcing servos from AliExpress, 8-10h assembly, and debugging servo ID conflicts.
We pre-assemble, test every servo, and ship it ready to plug in. So you can skip to the part that matters: training your first AI policy.
Plug into the ecosystem
Ready to build?
Pre-assembled. Tested. Ships with everything you need.
Launch special pricing — save $100 while it lasts