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HumanoidHyperspawn Robotics2023IN

Dropbear

Full-size open-source humanoid from Hyperspawn and Pointblank: FDM-printed structure on 20x20 aluminium extrusion, MyActuator CAN actuators, an ESP32 node per limb and a Jetson Orin brain. CAD, BOM, printables, firmware, URDF/MJCF/USD and simulation walking policies are public; a pre-assembled kit is on preorder.

activePreorderL2 Sim-verifiedbuildable

Difficulty index

12.0/13
12.0
Index breakdown
Classhumanoid+5
Cost$9,948 BOM+2
DOF32 DOF+3
Parts1835 parts+2
How the index works

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

Specimen photographs

17 items
  • Turntable render of the current Dropbear build. Looping, muted, 5.3 s.Hyperspawn · Hyperspawn · source
  • CAD render of the full Dropbear humanoid standing, open printed frame with yellow accent parts
    Full-assembly CAD render from dropbear_hardware.Hyperspawn · Hyperspawn · source
  • Simulation, not hardware: 30 s Isaac Lab rollout of the experimental v0.2.0 policy (model_10479.pt) at 50 Hz.Hyperspawn; policy by Hyperspawn Robotics and robit-man (dropbear-locomotion) · CC-BY-NC-SA-4.0 · source
  • Dropbear walking on its datasheet motor twin in Isaac Lab, with the per-motor torque dashboard and HW gate PASS
    Simulation: deployable walk on the datasheet motor twin (no-state policy, 20 ms target ramp). Hardware gate PASS.Hyperspawn (dropbear-wbc) · PolyForm-Noncommercial-1.0.0 · source
  • Dropbear waving after the typed prompt 'a person waves hello with the right hand', with the per-motor torque dashboard
    Simulation: live text to motion. A typed prompt, generated by Kimodo, played on the motor twin.Hyperspawn (dropbear-wbc) · PolyForm-Noncommercial-1.0.0 · source
  • CAD render of the Dropbear head on its six-leg stepper-driven neck platform
    Head and Stewart-platform neck subassembly (six NEMA 17 lead-screw legs).Hyperspawn · Hyperspawn · source
  • CAD render of the Dropbear right arm subassembly
    Right arm subassembly.Hyperspawn · Hyperspawn · source
  • CAD render of the Dropbear right leg with tie-rod ankle linkage
    Right leg subassembly with the tie-rod ankle drive.Hyperspawn · Hyperspawn · source
  • CAD render of the Dropbear pelvis with its hip actuators
    Pelvic girdle subassembly.Hyperspawn · Hyperspawn · source
Show 7 more
  • CAD render of the Dropbear torso cage built from 20x20 extrusion and printed brackets
    Torso subassembly: 20x20 extrusion cage and printed brackets.Hyperspawn · Hyperspawn · source
  • Simulation: v0.1.0 policy, 0.20 m/s robot-left command, in the dropbear-locomotion live viewer.Hyperspawn Robotics and robit-man (dropbear-locomotion) · CC-BY-NC-SA-4.0 · source
  • Simulation: v0.1.0 policy strafing, in the dropbear-locomotion live viewer.Hyperspawn Robotics and robit-man (dropbear-locomotion) · CC-BY-NC-SA-4.0 · source
  • Simulated Dropbear under joystick command in the live viewer, with COM trajectory, foot placement and value-loss readouts
    Simulation: joystick mode in the live viewer (model_8745), COM trajectory and foot targets drawn.Hyperspawn Robotics and robit-man (dropbear-locomotion) · CC-BY-NC-SA-4.0 · source
  • Screenshot of the dropbear-locomotion live viewer mirroring a domain-randomised training environment
    Live viewer mirroring an Isaac Lab training environment (randomised mass and friction).Hyperspawn Robotics and robit-man (dropbear-locomotion) · CC-BY-NC-SA-4.0 · source
  • Training curves for Dropbear locomotion v0.1.0, iterations 8666 to 8745: reward, survival, velocity tracking error, episode completion
    RSL-RL PPO continuation, 512 parallel environments: reward and survival recover to the full 1000-step horizon.Hyperspawn Robotics and robit-man (dropbear-locomotion) · CC-BY-NC-SA-4.0 · source
  • Training curves for Dropbear stage 65b, low obstacle and terrain scan, iterations 10380 to 10479
    Stage 65b (low obstacle + terrain scan): survival peaks near the horizon, then about 15 % of episodes still end in bad orientation.Hyperspawn Robotics and robit-man (dropbear-locomotion) · CC-BY-NC-SA-4.0 · source

Spec card

12/13 known
Degrees of freedom
32
Height
180 cm
Mass
45 kg
Payload
5 kg
Runtime
120 min
Battery
960 Wh
Price
$9,999 · Pre-assembled kit, $500 refundable deposit, ships Q2 2027 (first 500 units) per hyperspawn.ai. Options: five-finger hand +$1,000, Jetson Orin compute +$2,000, advanced policies +$4,000, covered shell +$500. Self-sourced BOM ~$10,400 (~$8,900 with a Jetson Orin NX); hyperspawn.ai quotes $1.5–3k in parts for a source build, which does not match the BOM.
BOM total
$9,948 · 86/94 lines priced
Part count
1835
Actuators
MyActuator RMD-X10, RMD-X8, RMD-X6 and CEM-60 over 1 Mbit/s CAN (18 per the 2026 BOM; myactuator-can lists 12 RMD-X8 Pro, 4 RMD-X10 V3, 6 CEM-60); 6 NEMA 17 lead-screw steppers in the Stewart-platform neck. hyperspawn.ai: servo + QDD.
Compute
NVIDIA Jetson AGX Orin 64GB (BOM; Orin NX 16GB alternative) plus one ESP32-DevKitC-V4 CAN node per limb. Kit: Raspberry Pi 5 base, Jetson Orin advanced.
Sensors
Intel RealSense D455f depth camera, IMU (center-IMU controller role), foot load cells (4x HX711 per foot, dropbear-feet), actuator encoders; five AS5600 magnetic angle sensors per leg controller (observation-safe firmware)

Not in the registry: speed. 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
  • +FDM 3D printing: 296 parts, about 460 h of printing
  • +Tools used: FDM printer, 220x220x250 mm minimum (validated on a Bambu Lab P1S), Calipers, Bambu Studio or PrusaSlicer, FDM printer, FDM printer with a TPU-capable extruder, Flush cutters, Drill bits matching M3/M4/M5/M8 clearance, 220-400 grit sandpaper +37
  • +40 assembly steps across 11 subassemblies
  • +Flashing firmware for left_arm, right_arm, left_leg, right_leg, head, torso, neck (Dropbear-Neck-Assembly), feet (dropbear-feet pressure.ino)
  • +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: MIT AND Hyperspawn-License. Software license: MIT AND CC-BY-NC-SA-4.0.

Repos & models

URDF ↗MJCF ↗USD ↗
SiteDocsBuyVideo

Build it

Has an ORP build package.
Build it on humanoidrobot.build ↗

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.

NoteReference implementation of the ORP spec; gets no ranking advantage anywhere in the suite. Three ways to get one: preorder the assembled kit ($9,999, $500 deposit, Q2 2027), self-source from the open BOM, or print and build from the repos. Level 2 (sim-verified), not 4: no physical walking is published and the locomotion repo calls its policies simulation releases; the v0.1.0 policy passed 128/128 zero-fall 20 s trials at 0.20 m/s in sim, so no top speed is listed. Spec sources conflict and the most recent official statement (hyperspawn.ai, 2026) is used: 1.8 m (home page says 6 ft), 45 kg (URDF sums to 47.7 kg, MJCF to 34.0 kg), 32 DOF (dropbear_firmware configures 31 joints across 6 limb nodes; the locomotion policy drives 14), 48 V battery (home-page label reads 24 V), 2–4 h runtime (lower bound stored). Battery energy is the BOM's 48 V 20 Ah pack. Licenses: most sub-repos are MIT (bom.md's footer says CC BY 4.0); the main Dropbear repo uses the non-commercial Hyperspawn License; dropbear-locomotion (code, weights, USD, media) is CC BY-NC-SA 4.0.

Sources

  1. [1]hyperspawn.ai: configure & preorder (price, deposit, ship date, specs)checked 2026-09-25
  2. [2]hyperspawn.ai: Dropbear spec sheetchecked 2026-09-25
  3. [3]hyperspawn.ai home (6 ft / 45 kg / 32 joints)checked 2026-09-25
  4. [4]hyperspawn.co (legacy domain, same site)checked 2026-09-25
  5. [5]Dropbear main repo READMEchecked 2026-09-25
  6. [6]dropbear_bom / bom.md (2026-04 pricing)checked 2026-09-25
  7. [7]dropbear_docschecked 2026-09-25
  8. [8]dropbear_printables (.3mf plates, print settings)checked 2026-09-25
  9. [9]dropbear_firmware CAN config (6 limb nodes, 31 joints)checked 2026-09-25
  10. [10]myactuator-can (actuator list, CAN IDs, limits)checked 2026-09-25
  11. [11]Dropbear-Neck-Assembly (6-DOF stepper neck)checked 2026-09-25
  12. [12]dropbear-feet (load-cell feet)checked 2026-09-25
  13. [13]dropbear-locomotion (policies, evaluations)checked 2026-09-25
  14. [14]v0.1.0 evaluation: 128 trials, 0 fallschecked 2026-09-25
  15. [15]dropbear_urdfchecked 2026-09-25
  16. [16]dropbear_mjcfchecked 2026-09-25