SO-101
Two 6-servo arms: move the leader by hand and the follower copies it, built for Hugging Face LeRobot
Prices and stock checked 7 Nov 2026
- Type
- Robot armThe Robot Studio + Hugging Face
- Build difficulty
- 3 of 5Advanced
- License
- Apache-2.0GitHub repo license
- Lowest price in stock
- $249.90at Seeed Studio
Where to buy the SO-101
| Seller | Price | Stock | Checked | |
|---|---|---|---|---|
| Seeed Studio Servo motor kit, no 3D printed parts | $249.90 | IN STOCK | checked 7 Nov 2026 | Buy |
| WowRobo Unassembled kit: leader + follower arms + camera | $259 | IN STOCK | checked 7 Nov 2026 | Buy |
| Seeed Studio Assembled kit | $299 | IN STOCK | checked 7 Nov 2026 | Buy |
| Pakronics Servo motor kit, no 3D printed parts | AUD 528 | OUT OF STOCK | checked 7 Nov 2026 | Buy |
| Switch Science Servo motor kit, no 3D printed parts, no AC adapter | JPY 46,731 | OUT OF STOCK | checked 7 Nov 2026 | Buy |
| Seeed Studio Printed frame only, add to a servo kit | $29.90 | IN STOCK | checked 7 Nov 2026 | Buy |
| OpenELab Printed frame only, add to a servo kit | $43.99 | IN STOCK | checked 7 Nov 2026 | Buy |
We check each seller's own page every day. Prices are the seller's list price before shipping and tax.
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What the SO-101 really costs
| Part | Cost | Source |
|---|---|---|
| Parts for two arms (leader + follower), BOM total US Servos, 2 control boards, USB-C cables, 2 power supplies, clamps, screwdriver set; BOM unit prices | $229.88 | github.com checked 7 Nov 2026 |
| Parts for one follower arm, BOM total US Single arm, no leader | $121.94 | github.com checked 7 Nov 2026 |
| Seeed SO-ARM101 Pro servo kit Motor kit only, no printed parts | $249.90 | seeedstudio.com checked 7 Nov 2026 |
| Seeed SO-101 3D printed parts Printed frame sold separately | $29.90 | seeedstudio.com checked 7 Nov 2026 |
| Seeed SO-ARM101 Pro assembled kit Assembled | $299 | seeedstudio.com checked 7 Nov 2026 |
BOM totals exclude 3D printing (or buying printed parts), shipping and import duties. The Seeed servo kit price does not include printed parts.
What it is
SO-101 (SO-ARM101) is the next version of the SO-100 robot arm, designed by The Robot Studio with Hugging Face. You build a leader arm and a follower arm, move the leader by hand and the follower copies it. It is made to work with the open-source LeRobot library.
Difficulty 3 of 5. Print or buy 3D parts, set motor IDs by script, assemble two arms, calibrate source
What it can do
- Teleoperate a follower arm with a leader arm
- Record datasets and train policies with LeRobot
Demo and build videos
Latest from X
- Parallel gripper concept for SO ARM7 Nov 2026
Robonine showed a new 85 mm parallel gripper concept for SO ARM manipulators with interchangeable soft or rigid pads, relevant to SO-101 builders.
NewsPost on X - LeRobot v0.7.07 Nov 2026
LeRobot went live with interactive robot prompting, streaming Hub datasets, remote GPU inference, and new VLAs that make covered kits like SO-101 more useful to build and train with.
Recent news and releases
- Hugging Face1,000+ public datasets match "so101"checked 7 Nov 2026
- GitHub releasehuggingface/lerobot: Release v0.7.05 Nov 2026
- GitHub commithuggingface/lerobot: chore(dependencies): Bump lerobot to 0.7.1 (#5269)5 Nov 2026
- GitHub commithuggingface/lerobot: chore(dependencies): Bump lerobot to 0.7.0 (#5268)5 Nov 2026
- GitHub commitTheRobotStudio/SO-ARM100: docs: list Seeed Studio and WowRobo first in kits section (#188)6 Oct 2026
- GitHub commitTheRobotStudio/SO-ARM100: Point the Robonine kit link at the SO-ARM101 kit page (#180)6 Oct 2026
- GitHub releasehuggingface/lerobot: Release v0.6.13 Aug 2026
- GitHub releasehuggingface/lerobot: Release v0.6.06 Jul 2026
- GitHub releaseTheRobotStudio/SO-ARM100: v0.1.117 May 2024
Parts list and links
Sourced facts
14 facts with links
- SO-101 vs SO-100: wiring, assembly, leader motors: SO-101 has improved wiring, is easier to assemble (no gear removal) and uses updated motors for the leader arm source · checked 7 Nov 2026
- SO-101 leader motors: Leader uses three gear ratios: 1/191 (shoulder pan, elbow), 1/345 (shoulder lift), 1/147 (wrist flex, wrist roll, gripper); follower is 6x STS3215 at 1/345 source · checked 7 Nov 2026
- SO-100 motors: SO-100 BOM lists 12 identical STS3215 servos for two arms at $15 each source · checked 7 Nov 2026
- SO-101 motors BOM: SO-101 two-arm BOM: 7x 1/345, 2x 1/191, 3x 1/147 STS3215 at $13.89 each source · checked 7 Nov 2026
- SO-100 BOM total (two arms, US): $232 source · checked 7 Nov 2026
- SO-101 BOM total (two arms, US): $229.88 source · checked 7 Nov 2026
- SO-100 assembly time: Docs: first arm a bit more than 1 hour, second arm under 1 hour source · checked 7 Nov 2026
- SO-100 status: SO-100 docs are marked deprecated in the repo README source · checked 7 Nov 2026
- SO-101 printing: Print files per arm (Ender 220x220 mm or Prusa 205x250 mm beds), PLA+, 0.4 mm nozzle 0.2 mm layer, 15% infill; 14 distinct individual parts source · checked 7 Nov 2026
- SO-100 printing: SO-100 print files also come as one tray per arm for Ender, Prusa/UP and Bambu A1 mini (2 parts) source · checked 7 Nov 2026
- Motor voltage options: Follower STS3215 7.4V is 16.5 kg.cm stall at 6V; 12V version is 30 kg.cm and needs a 12V 5A+ supply source · checked 7 Nov 2026
- HF parts estimate: Hugging Face says non-printed parts about $130 source · checked 7 Nov 2026
- GitHub stars: 8,019 on TheRobotStudio/SO-ARM100 source · checked 7 Nov 2026
- Other kit sellers named in repo: Seeed, WowRobo, RobotEd, Robonine, PartaBot, ForgeMotion Labs, RoboSEasy, NeoBot, Autodiscovery source · checked 7 Nov 2026
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