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Otto Ninja Starter robot 3D Printer File Image 1
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Otto Ninja Starter robot

HP Robots Otto avatarHP Robots Otto

November 10, 2025

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Description

Build your own robot like a Ninja šŸ±šŸ‘¤

This is the first emotional modular EdTech Arduino opensource robot that can walks & rolls!

Features

  • šŸ‘£ Walk & dance
  • šŸš— Transforms quickly Ā into a wheeled robotĀ 
  • šŸ‘©šŸ’» Simple Programming with Otto Blockly or Arduino
  • Expand to Humanoid here: Otto Ninja Humanoid 3D files
  • šŸ¦‡ Avoid obstacles with ultrasonic sensor
  • šŸ‘€ LED matrix or OLED emotional eyes to swap
  • šŸ”Š Makes emotional sounds and melodies
  • šŸ‘‡ Button for interactions
  • šŸ“± Wireless communication – for remote controllingĀ Ā 

Print instructions

Otto is very well-designed for 3D printing, so won't give you trouble if you follow this common parameters:

Recommended using an FDM 3D printer.
No need of supports or rafts.
Resolution: 0.2 mm or less
Fill density 15%

List of Parts

  • Otto Ninja PCB ESP8266 (you could use a wemos board with a servo shield)
  • Micro USB cable Data Sync
  • Battery 6F22 Rechargeable Lithium (9V 650mAh with USB port for charging)
  • Toggle switch + UBEC Regulator (OUT 5V/ 3A) + XH 2P connector + 9V Battery connector soldered.
  • 2 x Ninja Servo 180° metal gears (it comes with 3 screws)
  • 2 x Ninja Servo 360° continuous rotation metal gears (it comes with 3 screws)
  • 2 x Oring 68 mm OD 60 mm ID 4 mm
  • Ultrasonic sensor HC-SR04Ā 
  • Button module with headersĀ 
  • 4pin Dupont cable with connectorĀ 
  • 2 x 3pin Dupont cable with connector
  • Buzzer module with headers
  • Screwdriver Phillips 2.5x40mm (with magnetic tip)
  • 4 x Metal self-tapping screw M2*5 (they must be ferromagnetic)
  • Matrix 16x8 LEDs HT16K33 Ā (OPTIONAL)
  • OLED display 1.3" (OPTIONAL)
  • 3D printed Ankle Left BlackĀ 
  • 3D printed Ankle Right BlackĀ 
  • 3D printed Base BlackĀ 
  • 2 x 3D printed Foot BlackĀ 
  • 3D printed Inner Bottom BlackĀ 
  • 3D printed Legs BlackĀ 
  • 3D printed Starter Lid BlackĀ 
  • 3D printed Plate Matrix Lid Black Ā 
  • 3D printed Plate Ultrasonic Lid PinkĀ 
  • 3D printed Band Red

Buy similar kit here HP-Otto Invent Expansion - Creator Kit

How to Build video

What can Otto Ninja do?

Otto Ninja can walk, transform, roll, show emotions, dance, sense motion & objects

Coding from beginner to advanced

Program Otto Ninja to think on its own using block-based coding with Blockly or C++ with Arduino IDE.

Github repo here OttoDIY/OttoNinja

Want to just play?Ā 

Via the kit's wireless communication module, remote control your Otto Ninja by connecting to your mobile or tablet to race or have fun battles!

Alternatively you can try to build the previous design that uses more common off the shelf parts Otto Ninja robot Arduino Nano design by Otto DIY | Download free STL model | Printables.com

We invested lots of time and resources to provide open source code, software and hardware,Ā please support this project by just giving us a ā¤ Like, and shareĀ 

You are welcome to be a part of this friendly community of robot builders, teachers and makers.Ā 

Join today our Otto Builder community

License:

Creative Commons — Attribution — Share Alike

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