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Ultra-low-cost, fully open-source (Apache-2.0) bimanual leader-follower platform built from four 3D-printed 6-DoF SO-ARM101 arms driven by Feetech STS3215 servos. Designed by The Robot Studio with Hugging Face, it is the de-facto standard bimanual rig in the LeRobot community for ACT/imitation-learning data collection, with kits available from Seeed Studio and Waveshare for a few hundred dollars.
Listed Jul 2026
From ~$220 for the base dual kit (1 leader + 1 follower, Seeed/AliExpress); excludes 3D-printed parts. Assembled/complete-parts versions run up to ~$600.
Observed price, not an offer.
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The SO-ARM101 Dual is the bimanual configuration of The Robot Studio's SO-ARM100/101 open-source arm family. A full teleoperation rig pairs two leader arms (backdriven by the operator) with two follower arms, giving 4 total arms; a follower-only variant can be run for autonomous bimanual policies. Every arm is 3D-printed and actuated by six Feetech STS3215 serial-bus servos, and the whole system integrates natively with the Hugging Face LeRobot library, making it the dominant low-cost platform for collecting bimanual imitation-learning datasets (the bi_so101 dataset family). Payload is very low (~0.2–0.5 kg per arm) and the arms are host-PC driven rather than carrying onboard compute.
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