reBot Arm B601-RS is Now Open Source: RS vs. DM — Which 6 DoF Robot Arm Should You Choose?
Have you noticed since April 2026, we launched the first truly open-source desktop robotic arm, reBot Arm B601-DM, with a promise of “True Open-Source”? From hardware schematics and complete BOM lists to assembly videos, Python SDK, ROS2 drivers, and simulation models, we opened every design file and line of code to the global community. In just five months, this arm has shipped worldwide, empowering developers exploring robot manipulation, reinforcement learning, and world models.
Today, we bring you an exciting new choice: reBot Arm B601-RS is officially open source either!
It upholds the core philosophy of “True Open-Source” while introducing a new Robstride Dynamics quasi-direct-drive motor solution and a more powerful, extensible MotorBridge software console. Designed for developers seeking higher performance and more diverse experimentation, it provides a more robust starting point.
reBot Arm B601-RS: Key Specifications at a Glance
The reBot Arm B601-RS is not a simple hardware refresh; it’s a completely new solution designed for future deployment.
| Parameter | B601-RS Specifications |
|---|---|
| Degrees of Freedom | 6-DOF + 1x Gripper |
| Motor Solution | Robstride Dynamics 00, 06 motors |
| Power Supply | 48V DC, 12.5A |
| Communication | CAN Bus via USB2CAN adapter |
| Software Platform | MotorBridge (one-stop motor control & debugging platform, supports multiple motor brands) |
| OS Compatibility | Windows, Ubuntu, macOS |
| Kit Price | $1,499 (Assembled kit, includes gripper, excludes power supply) |
| Open-Source Power Design | 48V MeanWell power supply (BOM included) |
Three Core Upgrades, Explained:
- 💪 A More Powerful Core: Moving beyond 24V to embrace 48V Robstride Dynamics motors. Higher voltage enables stronger instantaneous torque and dynamic response potential, laying the foundation for experiments requiring fast, precise movements.
- 🧠 A Smarter “Operating System”: The core software is upgraded to MotorBridge. This is not just a simple host computer; it’s a comprehensive solution supporting multiple motor brands (DAMIAO, Robstride Dynamics, High Torque, MyActuator, etc.). It offers drag-and-drop graphical control, one-click zero-point calibration, built-in model visualization, and even a Beta AI Agent for assisted initialization, significantly lowering the debugging barrier.
- 🔧 More Thorough Open-Source: We open-source not just the arm, but also the enclosure design and BOM for the 48V power supply. From the core to the peripherals, we are committed to “True Open-Source” in every detail.
RS vs DM: Head-to-Head Comparison
Identical on the outside, fundamentally different on the inside. To help developers make an informed decision, here’s a direct side-by-side comparison.
reBot Arm B601-DM Version
- Motor Solution: 7× DAMIAO planetary gear joint motors (4× DM-J4310 + 3× DM-J4340P)
- Power Supply: 24V DC, 15A
- Kit Price: Value choice, approx. $1,299
- Initialization: Traditional host PC configuration & calibration
- Repeatability: 0.2mm
- Rated Payload: 1.5kg (70% workspace); Max 2.5kg
- Max Reach: 767mm (with gripper)
- Communication: CAN bus 1Mbps + UART 921600bps
reBot Arm B601-RS Version
- Motor Solution: Robstride Dynamics quasi-direct-drive joint motors
- Power Supply:48V DC, 12.5A
- Kit Price: excl. power supply, approx. $1,499
- Initialization: Supports AI Agent-assisted initialization (Beta)
- Repeatability:0.1mm
- Rated Payload: 2.5kg (70% workspace); Max 5kg
- Max Reach: 754.7mm (with gripper)
- Communication: CAN Bus via USB2CAN adapter
Together, they form the solid foundation of reBot Arm:
- Identical mechanical design and structure, with all structural parts and assembly methods being the same.
- Full open-source commitment: Hardware drawings (sheet metal/3D printing), detailed BOM, and software algorithms are all open.
- Consistent software ecosystem compatibility: Both natively support ROS1, ROS2 (Humble), Hugging Face LeRobot, Pinocchio, NVIDIA Isaac Sim, and the Python SDK.
- Same visual grasping demo: Supports a complete pick-and-place pipeline based on YOLO, depth cameras, and hand-eye calibration.
Developer’s Guide: DM or RS? How to Choose
Faced with two excellent options, how do you decide? We’ve outlined a clear selection logic.
On a budget or just getting started? Choose DM!
B601-DM is your best choice. At a highly competitive price of $1,197, it offers a complete 6+1 DOF desktop robotic arm experience. Its advantages include strong joint stiffness and better static load capacity. The trade-offs are higher heat generation and slightly lower dynamic performance. However, the open-source community has already accumulated rich tutorials and cases for this model. The 24V power solution is more common, making the DM version the optimal entry point into the world of open-source robotic arms and Embodied AI.
Pursuing performance or love to tinker? Choose RS!
B601-RS is built for exploration. If “good enough” isn’t enough and you want to push the performance boundaries of a 48V system, then the RS version is the hardware platform for you. Its Robstride Dynamics quasi-direct-drive motors offer higher torque and stronger burst force. This platform provides greater extensibility and future-proof experimental capabilities, especially suited for developers comfortable with advanced motor tuning and control algorithms like MIT control.
For research teams and Embodied AI researchers: Both versions perfectly support core research frameworks like ROS2, LeRobot, and Isaac Sim. The choice can be based on the lab’s existing motor preference, specific need for 48V performance, or project budget.
Beyond the Arm: Full-Stack Open-Source Ecosystem
reBot Arm was never just “a robotic arm.” It is a complete open-source hardware development and learning platform. We open-source everything to make the technology accessible.
“True Open-Source” covers every corner:
- Hardware Transparency: From STEP source files for sheet metal and CNC parts to detailed BOMs with procurement links for every screw, and comprehensive assembly videos, everything is public.
- Software Stack Openness: Python SDK, ROS1/2 driver packages, Pinocchio kinematics adaptation, Isaac Sim simulation USD models, and complete visual grasping code form a complete toolchain from control to AI.
- A Strong Partner Network as Backing:
- 🌍 Software & Frameworks: Hugging Face LeRobot (end-to-end robot learning), NVIDIA Isaac Sim (high-performance simulation), ROS community.
- ⚙️ Core Hardware Partners: Thanks to Damiao Technology, Robstride Dynamics, and Fashion Star Technology for providing high-performance motor and actuator solutions.
In response to community feedback, since May 11, 2026, the reBot Arm project has officially transitioned from the CC BY-SA NC license to the CERN-OHL-W 2.0 license. This means:
- Hardware and software source code are fully open.
- Commercial use is explicitly permitted, supporting startups, research institutions, and enterprise development.
- While maintaining open collaboration, it encourages continuous community feedback and improvement.
Join the ranks of global developers: All project progress, code, and documentation are updated in real-time on GitHub. A vibrant community with over 3.9k Stars is waiting for you!
Join the Open-Source Robotics Revolution
From the release of the first open-source project to shipping products globally, it took us just 5 months. This is thanks to the feedback, testing, and co-creation from every community developer.
The release of reBot Arm B601-RS is the next chapter we write together with the community. It represents better performance, a more open platform, and a firmer commitment to “True Open-Source.”
Whether you want to validate an algorithm, complete a course project, or launch a commercial venture, the tools, documentation, and like-minded community you need are here.
Start Exploring Now! Visit the GitHub repository to begin your Embodied AI development journey!→ https://github.com/Seeed-Projects/reBot-DevArm
Your Next Steps:
- ⭐ Star & Fork the official GitHub repository to track the latest developments.
- Visit the Seeed Studio Bazaar to check the B601-RS product details.
- Share your ideas on GitHub Issues or in the Seeed reBot Discord group to connect with developers worldwide.
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