Reference
KHR-3HV Ver.3.1 Kondo Kagaku
40.1 cm
Sold out 5 of 9 specs
KHR-3HV Ver.3.1
Sold out 2025 Consumer
Kondo's long-running bipedal hobby humanoid kit, now in a 22-servo Ver.3.1 sold through the official ROBOSPOT web shop.
Overview
The KHR-3HV is Japan's best-known hobby humanoid kit, made by servo specialist Kondo Kagaku since 2009 and still in production; the current Ver.3.1 22-axis edition went on sale in July 2025. The 40 cm, roughly 1.8 kg biped is assembled from an aluminum frame with 22 KRS-2552R3HV ICS servos, an RCB-4HV control board, and a 9.9V Li-Fe battery, and is programmed via Kondo's HeartToHeart software. Kondo lists it as open-price and sells it through its official ROBOSPOT web shop, with third-party sets typically in the $1,100-1,500 range. Popular for robot fighting and dance competitions like ROBO-ONE.
Use cases
Hobby robot building ROBO-ONE and robot competitions STEM and mechatronics education
Capability evidence
- Bipedal walking and fall recoveryThe 22-DOF KHR-3HV biped walks and, thanks to a smoother knee-joint fold, is designed to get back up more easily after falling. RobAid ↗ · 2009-06
- Programmable motion libraryControlled by the RCB-4 board and Heart to Heart 4 software, the kit ships with 31 recorded motions plus 9 wireless motions and supports custom motion programming. RobAid ↗ · 2009-06
In context
KHR-3HV Ver.3.1 among its peers
Pick a specification. We’ll surface the closest comparable robots automatically.
Closest by height Normalized values
Similar 01
Robovie-Z Vstone
31.5 cm
Shipping 6 of 9 specs
Similar 02
Bumi Noetix Robotics
94 cm
Shipping 4 of 9 specs
Similar 03
Booster K1 Booster Robotics
95 cm
Shipping 6 of 9 specs
Related robots
Unitree Shipping Unitree G1
A compact, mass-produced humanoid that brought bipedal robotics to a developer-friendly price.
- Height
- 1.32 m
- Payload
- ~2 kg per arm (3 kg EDU)
- DoF
- 23–43
Price
About $16,000 
Hanson Robotics Shipping Sophia
A well-known social humanoid built for lifelike expressions and public engagement.
- Height
- 1.67 m
- Payload
- 0.6 kg (per hand grip)
- DoF
- 83 (36 head/neck, 15 per arm+hand, 3 torso, 14 base)
Price
Price on request 
1X Technologies Pre-order NEO
1X’s consumer home humanoid, opened for pre-order in October 2025 at $20,000 (or $499/month), with US deliveries beginning 2026.
- Height
- 168 cm
- Payload
- 25 kg
- DoF
- 75 total (22 per hand, 14 arms, 12 legs, 3 neck, 2 spine)
Price
About $20,000