DESCRIPTION
Elf3 is BXI Robotics' medium-sized high-dynamic humanoid — a 145 cm, 35-40 kg biped with 31 degrees of freedom split as 7 per arm and 6 per leg, built on the company's own hollow-shaft planetary joint motors. Hip and knee joints peak at 150 Nm while shoulder and elbow reach 50 Nm and the wrist 25 Nm, giving it a 5 m/s top speed and a 5 kg end-effector load on over an hour of battery. Perception combines LiDAR with a depth camera, compute supports NVIDIA Jetson Thor, and the platform is open to developers. Elf3 is also BXI's ODM reference design: because only three motor sizes (85/70/50) build the whole machine, brand customers can restyle its exterior and structure around the same skeleton and reach production quickly. Running unmodified, it led the medium-sized category at the second Beijing E-Town Humanoid Robot Half-Marathon in April 2026 with a net time of 150 minutes.
FEATURES
- 31 DoF (7 per arm, 6 per leg) on in-house hollow-shaft planetary joint motors
- hip and knee peak torque 150 Nm, shoulder and elbow 50 Nm, wrist 25 Nm
- only three motor models (85/70/50) across the whole robot, cutting design and maintenance cost
- customisable exterior and structure for branded ODM builds (height is fixed)
- NVIDIA Jetson Thor support
- open developer platform
- control frequency above 1000 Hz on x86/ARM
- LiDAR plus depth-camera perception.
TECHNICAL SPECIFICATIONS
Verified| Physical | |
| Weight | 40 kg |
|---|---|
| Dimensions | H 1.45 m |
| Payload | 5 kg |
| Mobility | |
| Movement Type | Bipedal |
| Degrees of Freedom | 31 |
| Speed | 18 km/h |
| Manipulation | Mid |
| Actuators | BXI hollow-shaft planetary joint motors in three sizes (85 / 70 / 50), 24-48 V, dual encoders, MIT control protocol over CAN/CAN-FD |
| Power | |
| Battery Life | >1 h |
| Sensing & Compute | |
| Sensors | LiDAR, depth camera |
| Software / AI | Open developer platform; BXI locomotion, manipulation and navigation algorithm stacks |
TECHNICAL SPECIFICATIONS
Verified| Physical | |
| Weight | 40 kg |
|---|---|
| Dimensions | H 1.45 m |
| Payload | 5 kg |
| Mobility | |
| Movement Type | Bipedal |
| Degrees of Freedom | 31 |
| Speed | 18 km/h |
| Manipulation | Mid |
| Actuators | BXI hollow-shaft planetary joint motors in three sizes (85 / 70 / 50), 24-48 V, dual encoders, MIT control protocol over CAN/CAN-FD |
| Power | |
| Battery Life | >1 h |
| Sensing & Compute | |
| Sensors | LiDAR, depth camera |
| Software / AI | Open developer platform; BXI locomotion, manipulation and navigation algorithm stacks |
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FREQUENTLY ASKED QUESTIONS
What is the Elf3?
Elf3 is BXI Robotics' medium-sized high-dynamic humanoid — a 145 cm, 35-40 kg biped with 31 degrees of freedom split as 7 per arm and 6 per leg, built on the company's own hollow-shaft planetary joint motors.
Who makes the Elf3?
The Elf3 is made by BXI Robotics, a robotics company based in China.
How much does the Elf3 cost?
BXI Robotics has not publicly announced pricing for the Elf3. You can enquire through RobotAIGeek for current pricing.
What is the Elf3 used for?
The Elf3 is designed for research, humanoid locomotion research, robot competitions, and white-label odm production. It is used in research, education, and manufacturing settings.
What is the payload capacity of the Elf3?
The Elf3 has a payload capacity of 5 kg.
How much does the Elf3 weigh?
The Elf3 weighs 40 kg.
How fast is the Elf3?
The Elf3 can move at speeds of up to 18 km/h.
What is the battery life of the Elf3?
The Elf3 runs for >1 h on a charge.
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