ROBOTIS OP3 gets a ROS2-era role in miniature humanoid research

ROBOTIS moved OP3 into a 2025 re-release built for ROS2 operation, keeping the miniature humanoid relevant for labs and classrooms that still need physical biped hardware. The platform remains a 510-millimeter, roughly 3.5-kilogram research robot with 20 degrees of freedom, simulation support, and DYNAMIXEL ecosystem tooling.

OP3 comes from the ROBOTIS OP line that followed DARwIn-OP and ROBOTIS OP2. The hardware shift from older MX-28 actuators to XM430-W350-R DYNAMIXEL servos brought higher torque, protocol 2.0 support, current-based control, and smoother motion-planning features. The controller stack also moved from an Intel Atom-era board to an Intel NUC i3 with 8 GB RAM and a 250 GB M.2 SSD, paired with an OpenCR sub-controller, Logitech C920 camera, and inertial sensing.

Small humanoids still have a role because they sit between simulation-only work and full-scale robots. OP3 can be assembled, maintained, repaired, and programmed in teaching environments where a larger biped would be expensive or risky. The size limits its industrial relevance, but the 20-DOF body still gives researchers a whole-body platform for walking, perception, balance, behavior control, and student projects.

ROBOTIS supplies OP3 as a kit with spare parts, batteries, cables, documentation, SDK support and DYNAMIXEL actuators.

The 2025 re-release adds ROS2 support for teaching and whole-body robotics research.

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