Open Source RoboticsRobots, software & learning

Otto DIY Humanoid

Robot / hardware build

Six-servo Otto humanoid with V12 printable designs and a separately supplied historical control bundle; the four-servo base robot and newer alternatives are distinct. [1] [2] [3]

Build & first use →Official websiteSource codeUpstream build guideBill of materials

For
Arduino makers who already understand basic servo wiring and the four-servo Otto platform [1] [3]
Cost
No current cost yet. Upstream bill of materials [1]
Source rights
Named licenses are documented by part. Review licenses
Unknowns
host computer, tools, operating system not fully established. Review gaps

Source researched · Not tested by us
Sources checked · Research details

Licenses & related hardware

Research details and dates

On this page

Overview

Otto's humanoid expansion uses six servos: four move the legs and feet, and two move the arms. It is a different configuration from the familiar four-servo Otto biped. This profile follows the official “fat version” design page and its V12 printable parts, with the separately supplied original humanoid control archive. [1] [2] [3]

Is this for you?

Known limitations
  • No verified complete humanoid budget; exact board, battery/charger, servos, printing and delivery are unpriced.
  • The official page bundles V12 meshes, a V7 manual, original 2021 code and a separate NG alternative; their complete fit/runtime compatibility is not established.
  • Current OttoDIYLib release 13.0.0 is not a verified substitute for the historical OttoHumanoid class.

Editorial assessment from cited sources; no reproduction or compatibility test.

[1] [2] [3] [5] · Editorial assessment

Hardware & parts

Upstream bill of materials [1]

Hardware configuration

Printed six-servo humanoid with two arm joints and four leg/foot joints

[1] [3]

Actuators
  • Six micro servos; exact torque/voltage selection depends on build

[1]

Controller

Arduino Nano-compatible controller and I/O board; signal pin map must match selected historical code

[1] [3]

Degrees of freedom

6

[1] [3]

Assembly & first use

Open the upstream getting-started guide [1]

  • Select the official V12 humanoid meshes and six-servo BOM; keep OLD STL and OttoHumanoidNG alternatives separate.
  • Use the original-code archive linked on the same files page; inspect the six-servo pin map and center servos before assembly.
  • Reconcile Manual V7 with V12 parts and check power/board requirements; attempt calibration before a walking or app exercise.

Editorial assessment from cited sources; no reproduction or compatibility test.

[1] [2] [3] [6] · Editorial assessment

Cost

No current, complete configuration-specific build cost has been established for this profile.

A six-servo budget needs its own parts list

No current complete humanoid price is verified. Its BOM includes six micro servos, controller/I/O hardware, rechargeable power, ultrasonic sensor, buzzer, LED matrix, cables and printed parts; a programming computer, tools, shipping and tax also need consideration. Exact battery/charger and servo choices must match the selected board and mechanism. [1]

The mechanical page declares CC-BY-SA-4.0. The selected historical source archive contains BSD three-clause terms, whereas the current library advertises GPLv3. Record those scopes separately rather than assigning one license to every Otto variant or dependency. No firmware compilation, phone-app installation or physical walking test was performed. [1] [4] [5]

3D preview

Preview not available yet. The official download contains V12 meshes, STEP and F3Z geometry plus older and alternative files. No verified assembly preview has been prepared; source file inspection is not a fit check.

Model sources

The official download contains V12 meshes, STEP and F3Z geometry plus older and alternative files. No verified assembly preview has been prepared; source file inspection is not a fit check.

Project notes

Keep the downloaded versions together

The official files page contains an OLD STL folder, a V12 mesh set, STEP and Fusion F3Z files, a V7 illustrated manual, an original-code ZIP and an alternative OttoHumanoidNG ZIP. These are not one uniformly versioned release. Use the selected V12 head, body and grips, four copies of the leg/arm link, and the separate left and right feet. Match them against the manual before printing a full set. Real mesh, STEP and Fusion container payloads were inspected; fit and mechanical assembly were not tested. [2] [6]

Use humanoid control code explicitly

The original library archive supplied on that page contains OttoHumanoid.h and .cpp, with initialization and movement logic for six servos. Its README maps legs/feet to pins 2–5 and arms to pins 6–7. The same archive includes a humanoid app example. The current OttoDIYLib overview describes the four-motor base library, so installing today's library alone is not a verified replacement for this historical bundle. [3] [5]

Start by checking the selected Nano-compatible board and I/O mapping, power requirements and servo centers. Then reconcile the V7 manual with the V12 mechanism before attempting trim adjustment or a short motion. Optional Bluetooth, sound and LED features add wiring and software dependencies. The publisher recommends learning the basic Otto build first. [1] [3] [6]

What we checked

Source research only. No firmware compilation, dependency installation, CAD fit or strength validation, assembly, calibration, runtime or physical performance test performed. No affiliate links or supplier endorsement. Upstream design/media files are linked, not redistributed.

Not yet established

  • Requirements: operating system, host computer, tools

Updates

Upstream last updated
Not established
Latest release
Not established
Profile updated
Oct 28, 2026
Sources last checked
Oct 28, 2026
Next review
Nov 28, 2026
Reviewed revision
Printables225166 V12 mechanics and original2021 humanoid-control archive, retrieved2026-10-28; library13.0.0 comparator 21d4164e59cb4b16897e914779963e168efe0a65

Source files and licenses

Include this distinct physical design for Inspect and build a defined six-servo Otto humanoid while reconciling print, manual and library revisions. The inspected artifacts support a bounded source-researched next step; they do not establish reproduced hardware or commercial support.

LayerAvailability / license
mechanical designavailable · CC-BY-SA-4.0
V12 six-file STL set, STEP and F3Z inspected. Older STL and NG alternatives remain separate; assembly fit untested. [1] [2]
electronicsnot found · License not fully assessed
BOM and pin map specify bought-in Arduino Nano/I/O hardware; complete matching custom electronics design not established. [1] [3]
firmwareavailable · BSD-3-Clause
Selected historical archive license.txt has BSD three-clause terms; dependencies retain their own terms. Current GPL library is a different source snapshot. [3] [4]
documentationavailable · CC-BY-SA-4.0
Page declares CC-BY-SA-4.0; preserve asset-specific notices for any reuse. [1] [6]

No separate host runtime selected; Arduino IDE, Blockly and optional phone app are external tools, not verified here.

No learned policy or dataset is selected for the documented first task.

References

Each source links to the exact revision we read. “Used for” shows where this page relies on it.

Correction guidance · Discussion is not enabled · Profile format 0.7.0-draft.5

Change history