K-Scale Labs Z-Bot (Zeroth Bot) price & specs

K-Scale Labs (defunct) & community Z-Bot (Zeroth Bot) (1)

K-Scale Labs (defunct) & community Z-Bot (Zeroth Bot) (2)

K-Scale Labs (defunct) & community Z-Bot (Zeroth Bot) (3)

Not for sale · DIY BOM from ~$350

Discontinued · unavailableRL walkingCompany defunctOpen-sourced IPksim / MuJoCo

UnavailableShipping: Not available.

LEARN MORE (zeroth-bot) ↗

Overview

Treat this as an archive, not a product. The repos remain and a few hobbyists still build them, but there is no vendor, no official docs, and the software is orphaned. The Duck and Microduck offer the same Feetech-class, MuJoCo-trained experience with a living community.

Type: Biped robot · Open-source RL bipeds
Maker: K-Scale Labs (defunct) & community
Released: 2024
Price: Not for sale · DIY BOM from ~$350
Status: Discontinued · unavailable
Best for: Ages 16+
Programming: Open source (hardware + software)

Price and shipping

was $999. K-Scale shut down Nov 2025 and open-sourced everything

Shipping: Not available. Nobody sells it. DIY only, with Feetech servos from AliExpress (~2 weeks) plus printing. GitHub ↗

Specifications

Category	Bipeds · Open-source RL bipeds
Released	2024
Country	USA
Availability	Discontinued · unavailable
Sales	500 sold in the first 2 days after launch (2024, estimate) TechEBlog ↗
Programmability	Open source (hardware + software)
Built-in autonomy	None / scripted · Moves only when controlled, or plays preset motions
LLM support	Possible via SDK · Orphaned open-source software stack, no LLM features.
MuJoCo simulation	Sim-to-real kit · K-Scale's ksim-gym-zbot trains in MuJoCo (ksim) for deployment via kinfer. Vendor is defunct. ksim-gym-zbot ↗
NVIDIA Isaac simulation	Maker URDF only · K-Scale's kscale-assets includes a Z-Bot URDF, no Isaac package. kscale-assets ↗
Gazebo simulation	Maker URDF only · K-Scale's kscale-assets includes a Z-Bot URDF, no Gazebo package. kscale-assets ↗
Best for	Ages 16+ (estimated)
Vision sensors	Camera
Actuators	Smart servos (Dynamixel, Feetech…)
Audio	Speaker, Microphone
Compute type	Raspberry Pi, Other ARM chip
Balance type	RL walking
Height	~50 cm (sources say 40–50)
Weight	~2.8 kg
Compute	Raspberry Pi 4B (later Z-Bot), Milk-V Duo S (early Zeroth-01)
Speed	0.35 m/s (old site claim, unverified)
DOF	18–20 Feetech STS3215/STS3250
Sensors	BNO055 IMU, wide-angle camera, mic/speaker
Balance	RL policies trained in MuJoCo via K-Scale's ksim (JAX/MJX). Walking was "public alpha" and there is no push-recovery data.
SDK	kos-zbot, ksim-gym-zbot, kinfer (GitHub), docs site offline