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HumanoidK-Scale Labs2025US

K-Bot

Open-source full-size humanoid from K-Scale Labs; Founder's Edition units shipped in 2025 before the company cancelled pre-orders and wound down in Nov 2025.

discontinuedDIYL1 Compilednot buildable

Difficulty index

10.9/13
10.9
Index breakdown
Classhumanoid+5
Cost$8,999 list+2
DOF20 DOF+2
Parts763 parts+1.9
How the index works

Top of the ladder. This robot lives on the humanoid domains.

Specimen photographs

5 items
  • K-Bot studio render, three-quarter front view
    Studio render of the published MJCF, the model's zero pose. Geometry only; colours are the model's own materials.Rendered by Hyperspawn from kscalelabs/kbot-models (MIT) · Hyperspawn render · source
  • K-Bot studio render, side view
    Side view of the same MJCF render, the model's zero pose.Rendered by Hyperspawn from kscalelabs/kbot-models (MIT) · Hyperspawn render · source
  • 4 s turntable of the MJCF studio render.Rendered by Hyperspawn from kscalelabs/kbot-models (MIT) · Hyperspawn render · source
  • What’s Inside K-Bot? Full Hardware BreakdownK-Scale Labs · official video, embedded · source
  • Your First Personal RobotK-Scale Labs · official video, embedded · source

Spec card

10/13 known
Degrees of freedom
20
Height
140 cm
Mass
34 kg
Payload
10 kg
Runtime
240 min
Price
$8,999 · $8,999 for first 100 units (launch pricing, 2025)
Part count
763
Actuators
RobStride RS00 x2, RS02 x6, RS03 x8, RS04 x4
Compute
Raspberry Pi 5
Sensors
cameras, microphones, head sensor array

Not in the registry: speed, battery, bom total. Left blank rather than guessed.

What you learn building it

  • +Whole-body control
  • +Dozens of actuators on one bus
  • +Balance and fall handling
  • +Safe bring-up of a full-size machine
  • +CNC machining: 75 parts
  • +SLS printing (usually a print service): 15 parts
  • +Sheet metal: 2 parts
  • +Tools used: Bore gauge or pin gauges, RobStride Motor Studio (Windows/Linux), GPU workstation or cloud GPU
  • +24 assembly steps across 10 subassemblies
  • +Flashing firmware for Raspberry Pi 5, Raspberry Pi OS 64-bit, running kscalelabs/firmware (Rust, faux_rtos / faux-rtos binary, single-threaded), RobStride RS00/RS02/RS03/RS04 actuators, flashed with RobStride's firmware releases via Motor Studio, 1 Mbit/s CAN, K-Bot power board (CAN control/query/status/power frames 0x1001-0x1004; its firmware is not published), Hiwonder IMU over USB serial (driver sets 230400 baud)
  • +Testing in simulation (URDF/MJCF) before touching hardware
  • +Running published learned policies

Openness

100/100
  • publicCAD
  • publicBOM
  • publicFirmware
  • publicSim model
  • publicSoftware
  • publicPolicies

Score 100/100 computed from what is public: CAD 25, BOM 20, sim 20, firmware 15, software 10, policies 10. Hardware license: CERN-OHL-S-2.0. Software license: GPL-3.0.

Repos & models

URDF ↗
Docs

Build it

Discontinued.
Build it on humanoidrobot.build ↗Discontinued; mechanical BOM, STEP files and a rough assembly guide are public, but there is no electronics BOM and the custom power board has no public schematic or firmware. RobStride actuators have no listed prices.

Simulate

Load it in the browser simulator and train a policy before building.

Open on humanoidrobots.training ↗

Next rung

None. This is the top. Find people building it on humanoidrobots.team.

This is the top of the ladder.

NoteK-Scale cancelled K-Bot pre-orders, refunded deposits and laid off most staff (Nov 4 2025), releasing IP openly. Repo LICENSE files: HW CERN-OHL-S, SW GPL-3.0 (press reported SW MIT); the runtime repos (firmware, robstride, kos-kbot, kbot-models) are MIT, while kbot_deployment and kscalelabs/docs have no license file. Arm lift ~10 kg; runtime up to 4 h (swappable battery). docs.kscale.dev did not resolve on 2026-09-24, so docs are linked at their GitHub source. The mechanical BOM (Kbot_BOM.xlsx, rev KD, 2025-11-07) and 83 STEP files are in kscalelabs/docs. 20 actuated DOF per the docs actuator table; compute is a Raspberry Pi 5 per the electrical page. URDF masses in kbot-models sum to 36.7 kg vs the 34 kg launch figure. Repos not archived but inactive since Nov 2025.

Sources

  1. [1]K-Bot repochecked 2026-09-24
  2. [2]K-Bot mechanical BOM (Kbot_BOM.xlsx, rev KD)checked 2026-09-25
  3. [3]K-Bot docs: mechanical (RobStride actuator table)checked 2026-09-25
  4. [4]K-Bot docs: electrical (Raspberry Pi 5, 48 V bus)checked 2026-09-25
  5. [5]DesignSpark launch specschecked 2026-09-24
  6. [6]Humanoids Daily shutdownchecked 2026-09-24
  7. [7]Mike Kalil: K-Scale shuts downchecked 2026-09-24