Seeed open-sources reBot-DevArm, down to every screw

Seeed Studio has released reBot-DevArm, a 6-DoF (six degrees of freedom, meaning six independent joints) desktop robotic arm published as a full open-source project. Lukas Ziegler flagged it, calling it a project that lowers the barrier to learning robotics.

The interesting part is not the arm, it is what came with it. Ziegler says the hardware blueprints include sheet metal and 3D printed parts, and that the BOM (bill of materials, the parts list) covers every screw with purchase links. That is the piece most "open" robot arms quietly skip, leaving builders to reverse engineer fasteners and sourcing from photos.

The specs

Per Ziegler's post, the arm is rated at 1.5 kg payload, 650 mm maximum reach, 4.5 kg weight, and less than 0.2 mm repeatability, with six degrees of freedom plus a gripper. On the software side he lists a Python SDK, ROS1 and ROS2 support, Isaac Sim, and LeRobot, which covers both the classic robotics stack and the current learning-from-demonstrations crowd.

Those numbers put it in desktop research arm territory rather than industrial. A 1.5 kg payload and 650 mm reach is enough for the kind of tabletop manipulation work that fills robot learning papers, and the 4.5 kg total weight means one person can move it between benches.

Shown versus claimed

Every figure here is the vendor's own spec sheet as relayed in Ziegler's post. Nobody in the thread has independently measured the sub-0.2 mm repeatability, which is the number that matters most for anyone planning to do precise assembly work with it, and repeatability claims on low-cost arms are the ones that tend to soften under test.

Lukas Ziegler

@lukas_m_ziegler

X

Detailed BOM covers every screw with purchase links.

Lukas Ziegler

@lukas_m_ziegler

X

When every screw, CAD file, motor driver, and algorithm is freely available, desktop robotic arms become accessible to students, researchers, and developers worldwide.

The open-source claim is at least checkable in a way the specs are not. If the CAD, the drivers and the parts list are all actually published, the first few people who build one will say so quickly. Ziegler's framing is that this is the version of open source robotics that actually counts.