Yes—but only in the narrow sense originally intended. A classic Otto DIY robot can be mechanically assembled in roughly an hour when its electronics and 3D-printed body are already prepared. The complete project takes longer: printing the parts can take about eight hours, followed by software installation, servo calibration, testing, and troubleshooting.
Otto DIY is a small, open-source, Arduino-compatible educational robot that can walk, dance, play sounds, and react to obstacles. In 2026, however, there is an important buying distinction: the original official Otto DIY kits are no longer produced. The open-source project remains available, while HP Robots Otto is the current commercial successor.
What is Otto DIY?
Classic Otto DIY is a four-servo, 3D-printable biped robot designed to teach basic electronics, programming, robotics, and mechanical assembly. Its Arduino Nano-based electronics control two legs, two feet, an ultrasonic distance sensor, and a piezo buzzer.
With the appropriate program, Otto can walk, dance, make sounds, perform gestures, and avoid nearby obstacles. Its obstacle avoidance is simple ultrasonic-distance behavior—not mapping, computer vision, or autonomous navigation.
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The project is open source across its hardware, software, and printable designs, making it suitable for modification and remixing. If you redistribute modified designs, follow the applicable attribution and share-alike terms described in the official FAQ.
Do not assume that every robot using the Otto name is the same build. Otto DIY, Otto Wheels, Otto Humanoid, Otto E, HP Robots Otto, and community remixes may use different body files, boards, sensors, firmware, and instructions.
The 2026 availability warning
The official store currently says that classic official Otto DIY kits are no longer produced. Old pages and marketplace listings may still show historical Builder or Maker Kit prices, but those prices should not be treated as current official buying information.
The original files and community projects remain useful if you already have the parts or want to source them yourself. But a marketplace kit should be treated as third-party unless its seller, components, documentation, and support can be verified. Copycat kits may contain different Nano boards, servos, wiring, or firmware.
For a current officially supported product, the relevant option is HP Robots Otto Creator Kit. It is not simply the old kit with a new label; its electronics, power system, sensors, connectivity, and software workflow differ.
What you need for classic Otto DIY
Basic parts
- Arduino Nano ATmega328
- Nano I/O shield
- USB-A-to-Mini-USB cable
- HC-SR04 ultrasonic sensor
- Four SG90 9g micro servos
- Piezo buzzer
- Female-to-female Dupont wires
- AA battery holder
- Four new alkaline AA batteries
- On/off switch
- 3D-printed head, body, two legs, and two feet
Use the bill of materials and manual for the exact revision you are building. Official documentation contains small list variations, including different counts of Dupont wires, so mixing instructions from different Otto versions can cause confusion.
Tools
- Small Phillips screwdriver
- Scissors or pliers
- Computer
- FDM 3D printer, if the plastic parts are not supplied
The original kit design aimed to avoid soldering. That is a design goal for the intended kit, not a guarantee that every third-party clone will be plug-and-play.
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Builder Kit versus Maker Kit
The distinction explains much of the original one-hour promise:
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- Builder Kit: included the electronic components and the 3D-printed body parts.
- Maker Kit: included the electronics but expected you to print or otherwise create the body.
A Builder Kit with prepared parts could plausibly reach a first movement in one session. A Maker Kit cannot be completed in one hour if the body still needs to be printed.
3D-printing the classic body
For classic Otto, the official guidance recommends:
- FDM printing with PLA filament
- No supports or rafts
- Approximately 0.20 mm layer height; 0.30 mm is also acceptable
- At least 20% infill
- About 115 g of filament, or roughly 14.5 m of 1.75 mm filament
- Approximately eight hours for a complete set, depending on the printer and settings
Download the correct models from the official HP Robots Printables collection rather than relying on an unverified STL mirror.
Fit matters. Warped feet can affect walking, inaccurate dimensions can make servo mounting difficult, and a tight servo pocket can damage printed PLA. Printing faster may save time but reduce the fit quality needed for reliable movement. Check that the files match your electronics and Otto variant before printing.
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Use the official Otto DIY documentation and manual for the illustrated screw and wiring details. The high-level build sequence is:
- Confirm the Otto revision and identify every component.
- Check the Nano, shield, sensor, buzzer, switch, battery holder, and four servos.
- Install the servos in the printed body, legs, and feet.
- Attach the legs and feet with the specified screws.
- Install the head and HC-SR04 sensor.
- Connect the servos, sensor, buzzer, battery holder, switch, and Nano shield exactly as shown in the relevant manual.
- Center the servos before permanently tightening the servo horns or arms.
- Connect the Nano to the computer using Mini-USB.
- Upload a test program.
- Power Otto from the battery holder and test it on a clear, level surface.
- Calibrate servo offsets if it leans, walks in circles, or moves unevenly.
Servo centering is the most important mechanical step. If the horns are installed while a servo is not in its neutral position, the feet can point in different directions even when the code is correct. That produces poor walking, scraping, leaning, or falls.
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How long does it really take?
| Stage | What to expect |
|---|---|
| Unpack and identify parts | A few minutes |
| Mechanical assembly | Potentially about an hour with prepared parts |
| 3D printing | Separate process; official guidance estimates about eight hours |
| Software installation | Additional time for Arduino IDE, libraries, or legacy software |
| First upload and testing | Additional time, especially with clone boards |
| Servo centering and calibration | May require retries and mechanical adjustment |
The honest interpretation is therefore: about one hour to assemble a prepared classic kit, not one hour from STL files to a reliably calibrated robot.
Programming Otto for the first time
Arduino IDE: the current classic-DIY route
The current official site identifies the classic DIY path as Arduino IDE-based. A typical workflow is:
- Install Arduino IDE.
- Install
OttoDIYLibthrough the Arduino Library Manager, or install it using the ZIP-library method described in the official library repository. - Open an example from
File > Examples > OttoDIYLib. - Select the appropriate Arduino Nano board and processor.
- Select the correct serial port.
- Compile and upload the sketch.
Useful examples include Otto_allmoves.ino, Otto_avoid.ino, Otto_CalibrationWalk.ino, Otto_testSensor.ino, melodies, and dance routines.
There is no universal processor setting for every Nano-compatible board. Clone boards may also need a USB-serial driver. If uploading fails, identify the actual board and follow its documentation rather than installing a random driver.
Blockly: an older workflow
Older Otto documentation describes Otto Blockly: install the software, open an example, connect Otto, choose Arduino Nano and the correct USB port, inspect the generated code, and upload it.
The current official software page describes DIY Blockly as old software for DIY enthusiasts. Do not mix its instructions with the newer HP Robots Otto software ecosystem.
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A robot can be electrically functional and still walk badly. Common symptoms include one foot being rotated differently, a leaning body, circular walking, scraping feet, or falling during a dance.
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- Turn off battery power.
- Confirm that each servo horn was installed in its centered position.
- Check that every servo is plugged into the expected shield position.
- Upload
Otto_CalibrationWalk.inofromOttoDIYLib. - Adjust offsets incrementally.
- Retighten screws only after the neutral pose is correct.
- Test individual movements before running a complete dance routine.
Start testing with Otto lifted slightly or positioned where its feet cannot catch on cables. Move to a flat surface only after the servos respond correctly.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common problems
Otto does nothing
- Check battery polarity and the power switch.
- Check the USB connection and selected serial port.
- Confirm the Nano board and processor settings.
- Verify that the board is detected.
- Check servo positions and shield connections.
- Confirm that the sketch matches the hardware revision.
The upload fails
Common causes include the wrong board or processor, wrong serial port, a charge-only or damaged cable, a missing driver on a clone board, a missing OttoDIYLib, or a library mismatch. Use the official library installation instructions rather than combining libraries from unrelated Otto remixes.
Servos jitter, reset, or move weakly
Inspect the battery supply, Dupont connections, servo condition, and printed parts for mechanical binding. Do not assume that any USB source is suitable for powering multiple servos; follow the wiring and power guidance for the exact revision.
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Check servo centering, horn placement, leg symmetry, and calibration offsets before changing the program.
Obstacle avoidance does not work
Check the HC-SR04 orientation and wiring, run the correct sensor example, and confirm that the firmware expects that sensor. Ultrasonic readings can also be affected by the angle and position of nearby surfaces.
Which Otto should a beginner choose?
Classic Otto DIY
Choose it for Arduino learning, 3D-printing, mechanical experimentation, and open-source remixing. It is a good project for a maker who is comfortable sourcing parts, checking wiring, and calibrating servos.
It is a poor fit if you expect a currently manufactured official kit, guaranteed compatibility, rechargeable power, wireless connectivity, or a completely guided experience for a young child.
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Otto Wheels
The official FAQ identifies Otto Wheels as an easier starting point for beginners. Its wheeled design avoids much of the leg alignment and walking calibration required by the biped.
HP Robots Otto
The current HP Robots Otto Creator Kit is better suited to classrooms, families, and users wanting a supported current product. The listed kit includes a custom Arduino-compatible PCB, integrated Bluetooth and Wi-Fi, a rechargeable 3.7 V 1800 mAh battery, USB-C, RGB LEDs, ultrasonic and line-following sensors, metal-gear servos, and block-coding plus Python/C++ workflows.
The buying page listed the Creator Kit at €129.95 and in stock on August 18, 2026. Availability and price can change. It also excludes the 3D-printed plastic body parts, so it is not a fully pre-printed version of the historical low-cost kit.
Classic Otto DIY versus HP Robots Otto
| Priority | Better choice | Reason |
|---|---|---|
| Learning individual electronics | Classic Otto DIY | Simple Nano-based parts and open-ended tinkering |
| Printing and remixing | Classic Otto DIY | Printable community design ecosystem |
| Easy mechanical introduction | Otto Wheels | Fewer walking-alignment issues |
| Current official support | HP Robots Otto | Newer hardware and software ecosystem |
| Rechargeable power and wireless features | HP Robots Otto | USB-C, battery, Bluetooth, and Wi-Fi |
| Lowest-cost loose-parts experiment | Classic-compatible build | Potentially cheaper, but with greater compatibility risk |
What Otto can—and cannot—do
Otto is excellent for learning cause and effect: a sensor reads distance, the microcontroller interprets the reading, and servos produce movement. You can alter gait timing, melodies, gestures, obstacle thresholds, and body designs.
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The Bottom Line
Bottom line: Build classic Otto DIY if you want an open-source Arduino and 3D-printing project and already have—or can source—the parts. Treat “one hour” as prepared-kit assembly time. Choose HP Robots Otto if you want a current official product with rechargeable power, wireless connectivity, and a newer classroom-oriented software path.
Quick Recap
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