Build Otto, a tiny 3D-printed walking robot for kids and makers: media published by Otto DIYCredit: Otto DIY

Build Otto, a tiny 3D-printed walking robot for kids and makers

Humanoid, Easy

Otto DIY is an open-source biped with 4 servos that walks, dances and avoids obstacles, programmed with Arduino libraries or blocks.

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Print the body, wire servos to an Arduino Nano or ESP32, and load the OttoDIYLib examples.

Hardware & cost: Under ~$50 in parts: 4 SG90 servos, a Nano or ESP32, ultrasonic sensor, buzzer.

Difficulty: Easy.

Agent install prompt (paste into Claude Code, Cursor or Codex): "Install the Otto library from https://github.com/OttoDIY/OttoDIYLib in Arduino IDE, then write a sketch that walks forward and dances when something is closer than 10 cm."

Source: OttoDIY/OttoDIYLib on GitHub — https://github.com/OttoDIY/OttoDIYLib (facts checked against the project README, Oct 2026; prices vary by region).

Quick answers

What do you need to build Otto, a tiny 3D-printed walking robot for kids and makers?: Under ~$50 in parts: 4 SG90 servos, a Nano or ESP32, ultrasonic sensor, buzzer.
How hard is it to build Otto, a tiny 3D-printed walking robot for kids and makers?: Easy.

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