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Posted on Originally published at x.com

The Robot That Splits in Half: What D1's Modular Body Actually Changes

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The Robot That Splits in Half: What D1's Modular Body Actually Changes

A robot that is two robots, or one, depending on a coupler. D1 — built by Hong Kong's Direct Drive Technology — ships as two 24.3 kg wheeled-legged modules joined by a magnetic coupler at the centre of the body. Docked, they form a 48.5 kg quadruped. Split, they are two independent bipeds, each carrying its own battery and its own computer. Nobody has to touch them to make the switch.

That is what the footage tests, and it holds: the machine re-docks itself with no human hand involved and keeps moving.

The body is the configuration

Most legged robots answer a single terrain. Bipeds are efficient on flat ground; quadrupeds are stable on the rough stuff. D1 declines to choose. A single module is a wheeled biped rated at 2 m/s. Clamp two together and the pair becomes a 48.5 kg quadruped rated at 3.2 m/s — roughly 11 km/h — with up to 100 kg of payload prone and 80 kg standing. The same hardware covers both cases; the difference is a coupling decision.

Modularity here is not a marketing word for "upgradeable". The legs, wheels, sensors and arms are all designed to attach to the same core, and a second module is a peer rather than an accessory: it brings its own compute, its own battery and its own autonomy, which is why the split state is not one robot limping in two pieces but two working machines.

What's inside each module

Per module: an NVIDIA Jetson Orin NX 8 GB running Ubuntu 22.04 with ROS 2 support — the same stack research teams already use. A 43.2 V / 9 Ah pack (388.8 Wh) gives at least five hours of no-load runtime and up to 25 km of travel, recharged in under two hours. Rolling speed tops out at 11 km/h in the docked configuration; the manufacturer lists 2 m/s for bipedal mode and 3.2 m/s for quadrupedal. The docked pair clears obstacles up to 70 cm, with 50 cm recommended as the working limit.

Direct Drive Technology also publishes its own ROS 2 SDK, IsaacLab reinforcement-learning environments and a sim2real bridge — the software side is deliberately open, which tends to matter more for adoption than any single spec.

Why modularity is the real claim

The interesting number is not the payload; it is what the reconfiguration removes. Instead of buying a biped for corridors and a quadruped for rubble, an operator buys one platform and lets it change shape to suit the ground in front of it. Fewer machines, fewer spares, one software stack — the argument is maintenance and inventory, not spectacle.

It also changes what "fleet" can mean. If modules are peers, a field team can start with a quadruped and end the week with two bipeds, with no new hardware shipped.

What to watch

"World's first fully modular robot with embodied intelligence" is the vendor's phrase, not a measured benchmark — filed next to every other robotics first-claim. Pricing, though, is public: $7,499 for a single biped, $13,999 for the pair.

The next thing to watch is not the docking trick. It is whether a group of these can re-configure mid-task, without downtime and without a human hand.

Watch the demo (video):

https://x.com/pgol80/status/2104546645732147387

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