How Direct Drive’s D1 Uses Body-Level Modularity to Reconfigure Robots

Direct Drive’s D1 is designed around a different kind of modularity. Rather than only swapping tools or changing software, the Dongguan-based company is trying to make the robot’s physical body reconfigurable: a D1 can operate as an individual wheel-legged unit or join other units to form a new machine. The goal is to reuse a common technical foundation across varied industrial tasks instead of engineering a wholly new robot for each one. 46

The core idea: reconfigure the body, not just the payload

D1 units use a self-developed joining mechanism that supports configurations including head-to-head and tail-to-tail docking. Combining units changes the machine’s overall length, support structure and task form. Those physical changes can create more room for payloads or produce a body layout better suited to a particular route or job. 46

This is why the “Lego robot” comparison is useful, with an important qualification: the system is not simply a collection of passive blocks. For body-level modularity to work in the field, a newly connected robot must also understand what it has become.

Docking is followed by topology recognition and a new dynamics model

According to reporting on the platform, after multiple D1 units are joined, the system automatically identifies the resulting body configuration and updates its multi-body dynamics model. It then brings the connected units into a unified motion-and-control system. 46

In practical terms, that means the controller is intended to account for a changed physical system rather than treating it as the original single robot. A joined configuration has a different geometry, mass distribution and support arrangement, so its locomotion and coordinated movement need to be controlled as one machine. Direct Drive describes coordinated control in its wheel-legged robots as the ability for the robot to function as a unified entity. 3

The important distinction is between mechanical docking and usable reconfiguration. Docking supplies the new structure; automatic recognition and model rebuilding are what allow the control stack to respond to that structure.

A reusable hardware and software foundation

The D1 approach depends on sharing core systems across configurations. Reporting says the platform connects hardware buses, sensor data and multi-body dynamics computation, while Direct Drive’s direct-drive motors and integrated joint technology provide the actuation foundation for wheel-legged motion. 34

That shared architecture is central to the commercial argument. Instead of recreating motors, joints, power, sensing, communications and control for every specialized machine, the company can aim to adapt a common platform to different physical configurations and payload setups. Potential applications cited for D1 include inspection, delivery and emergency-response work. 418

This does not eliminate task-specific engineering. Payload interfaces, safety validation, autonomy behavior and site integration still need to fit each deployment. But it can reduce the amount of whole-robot redevelopment required when the underlying locomotion and control systems are reused.

D1-SET shows what the concept looks like in logistics

The D1-SET cargo-box scheme is a more concrete expression of the platform strategy. Reported capabilities include using body docking to enlarge the available central payload area, autonomously attaching and releasing cargo boxes, and arranging multiple boxes along the robot body when more carrying space is needed. 4

The same reporting describes a person-following mode using UWB and depth cameras, with demonstrations spanning indoor and outdoor movement, elevators and steps, including loaded stair traversal. 4

For logistics operations, the appeal is flexibility: a smaller robot could be used when the route or load is limited, while connected modules and additional boxes could be used when capacity needs increase. That is a different proposition from a fixed-base delivery robot, whose carrying volume and footprint are largely set at purchase.

Why direct-drive joints matter to the platform

D1’s modular-body concept is supported by the company’s broader direct-drive technology. Direct Drive says D1 launched in October 2025 as a fully modular dual-wheel-legged robot, and its public filing describes coordinated control as a capability of its wheel-legged systems. 3

Direct-drive motors and integrated joint modules are relevant because a reconfigurable machine needs repeatable, coordinated actuation across its parts. The company has presented its P10 joint modules as integrating motor, sensor, driver and controller functions; reporting links those modules with rapid multi-module assembly and a coordinated-control algorithm. 23

The strategic point is not that a motor alone makes a robot modular. It is that standardized propulsion, sensing and control components make it more feasible to carry the same motion platform into multiple body configurations.

Fast customization is part of the bet

A modular platform only becomes commercially useful if it can be configured and delivered without losing the cost and time benefits of reuse. One report says Direct Drive has more than 40% of staff in R&D and is experimenting with a 30-day rapid-delivery model. 4 However, a separate report based on company filing data put R&D personnel at 192 people, or 34.9% of employees, as of June 30, 2026. 21

Those figures should not be treated as directly equivalent: they may reflect different reporting dates or definitions. What they do show is that the company is positioning R&D capacity and flexible manufacturing as complements to the D1’s technical modularity.

What is established—and what still needs proving

The available reporting supports the central technical claim: D1 units can physically join, the system can recognize a new configuration, and it can update its dynamics model and unified control framework. 46 The cargo-box concept also provides a plausible illustration of how variable body shape can be used for transport. 4

But the strongest claims about industrial value remain early. Much of the detailed evidence comes from company-oriented coverage, product reporting and demonstrations rather than independent, long-duration operating data from production sites. The key test for D1 will be whether its docking reliability, control robustness, maintenance demands and safety performance hold up across repeated real-world deployments.

For now, D1 is best understood as a platform bet: make the robot’s body itself programmable through physical assembly, then reuse the same actuation and control stack across more than one type of machine.