Preparing the hardwareDriven
by tension.
The motor turns the small drum. Tensioned rope drives the larger drum—and the leg.
9:1Nominal reduction
Some things are worth building here.
American-built hardware.
From the mechanism to the machine.
Out of the workshop.

Choose what
you can build on.
Go2 Pro$2,800 | QuadFrom $2,995 | SpotContact sales |
|---|---|---|
| Payload | ||
| 8–10 kg | 25 kg | 20.43 kg |
| Development access | ||
| Not on Pro | Open Source SDK | SDK available |
Sources & specification notes
Diagram dimensions are length × height. Quad follows the current modular CAD pose. Go2 and Spot outlines are scaled to their published standing dimensions; Spot uses its 61 cm default walking height. Model credits and licenses.
Zeronce’s price, 25 kg payload capacity and 60 cm drop with 10 kg onboard are founder-provided specifications. Quad is in development; the motion scenes are simulations.
Go2 Pro specifications: price excludes tax and freight. Development access differs by trim; EDU supports secondary development.
Spot specifications: 20.43 kg is the current maximum recommended payload; placement can affect performance. Payload ratings are not measured under identical conditions.
Spot SDK is available under Boston Dynamics’ license. Joint-level control requires a separate license. Contact Boston Dynamics for pricing.