B grade Authoritative secondary, traced to origin

A USD 2,500 biped: what LeRobot Humanoid hands you, and what it does not

The first bipedal humanoid at this price that you can start training on without redesigning the structure. The value is not the price tag — it is that hardware, runtime, identification, training environments and a policy zoo arrive in one release. What did not arrive is what decides how much extra you actually pay.

Structural files: 75 STL parts, printable in PLA+ / PETG
Editable CAD: No STEP released; changing structure means rebuilding it yourself
Print envelope: Minimum 220x220x250 mm; load-bearing parts at 80% infill, 5 perimeters
BOM: About USD 2,500, of which motors are roughly USD 1,880
Licence: Apache 2.0
Repo: github.com/huggingface/lerobot

Files you actually get: 75 STL parts cover torso, hip, thigh, knee, shin, ankle and foot subassemblies, and the BOM names the exact motors and hardware part numbers — there is no sourcing work left to do. The more valuable half is that the same release carries the runtime, the identification pipeline, the training environments (MJLab) and the policy library. That is what "closed loop" means concretely. What is missing is editable structure. You get STL, not STEP: lengthening a link by two centimetres means rebuilding a mesh into a solid model first.
BOM and delivered cost: Motors are about USD 1,880 — over 70% of the machine. Printed parts come to roughly USD 56 of filament, and the rest is the bus adapter, hardware and fasteners, for about USD 2,500 total. That figure excludes the printer, the tools, and every print you ruin. At 3.5 kg of filament, buying double the material for the first round of iteration is normal rather than wasteful.
Printing and machining: The minimum envelope is 220x220x250 mm, so an ordinary desktop printer can do this — but load-bearing parts such as thigh and knee want 80% infill and 5 perimeters, while shell parts are fine at 20%. That difference decides whether it stands up; do not flatten the settings to save time. Budget the whole print in days, not hours.
The hard step: Not printing — getting both legs to actually stand. The gap between simulated parameters and the real machine has to be closed with the official identification pipeline, and there is no shortcut there. Second is the bus: the Robstride motors speak CAN FD, not the signal wiring hobby servos use. Correct wiring does not guarantee a working bus; termination and a controller with a real CAN peripheral both have to land.
What we checked: We checked three things: (1) the release scope — whether hardware, runtime, identification, training and policies sit under the same licence; (2) whether the motor types and counts in the BOM match the described 12 actuated degrees of freedom; (3) the minimum print envelope and the infill requirement on load-bearing parts. We have not built it. So "does it walk once assembled" carries no first-hand conclusion here — on this site's own scale that keeps the entry at grade B rather than D, and we will upgrade it when a build log exists.

This site's call

Currently the only biped where buying the parts is enough to get to the actual subject, which is robot learning. It suits someone who already owns a 3D printer and wants to train policies rather than design mechanisms. If you came to build a humanoid with your hands, 75 printed parts and a CAN bus will keep you busy for a long while — and if you just want legs moving soon, get the full pipeline working on a desktop arm first.

What is included, and what is not

	What	What it means for you
Included	Structure, BOM, runtime, identification, training environments, policies	No months lost to design and selection work; you start at the actual subject
STL only	No editable solids	Any change to a dimension, hole pattern or mounting face means rebuilding it. Small changes are the expensive kind
Excluded	Tools, printer, filament margin, the batches you ruin	USD 2,500 is the parts bill, not what it costs you to get it standing

One question before you commit

Ask where the editable source files are — STEP or native CAD. That single question sorts projects in two: those you will be able to change later, and those you can only copy. Neither is wrong, but the budget and the expectation differ.

Sources

Official release and hardware repository (STL count, BOM, printing guide, licence)
Official training environment and policy library documentation (MJLab, identification pipeline)

Objects in this entry

Last checked 2026-09-28