Be sure to read all instructions carefully beforehand to ensure you fully understand the process before getting started—and to avoid any unpleasant surprises.

Required Components:

• 9 MG90S Servo Motors (MG90s are not sufficient): 10pcs Metal Gear Servo Motor: MG90S Micro Servo Motor Compatible with Arduino, Fully Metal Gear Servo—180° Adjustable Angle, Mini Motor for Arduino: Amazon.fr – Games & Toys
• Arduino Board (ESP32 recommended): Diymore 3PCS ESP32 WROOM 32 ESP32 USB C ESP32 NodeMcu Development Board, 2.4 GHz WLAN WiFi Bluetooth CP2102: Amazon.fr – Computers
• 22 M2 Screws, 8 M3 Screws: huruirui M2 M3 M4 M5 Nuts and Bolts, Assorted Washers Set, 1065 Pieces – Black Hex Socket Head Cap Screws, Bolts & Nuts Kit, Machine Threaded Bolts & Nuts Set, Assorted Tool Kit: Amazon.fr – Home Improvement

Assemble all servo motors using 2 screws per motor. Also secure the “rear” and “rear mounting” components with screws. You should end up with something like this:

Take the 8 legs and attach them using these parts:

Install them as follows:

Add some adhesive—this will help secure everything in place. The final result should look like this:

Be sure to leave enough clearance for the screws.

Repeat the same process for the front section—but this time, use this additional part:

Next, assemble the “front,” “middle,” and rear sections using M3 screws and nuts (use M2 screws only with a flat washer).

All that’s left is to screw in the servo motors.

Your robotic dog is now complete.

The GitHub repository link:

GitHub – PetoiCamp/OpenCat: An open-source framework for developing Boston Dynamics–style quadruped robots, ideal for STEM education, coding and robotics, IoT robotic applications, AI‑enhanced robotic service applications, and DIY robotic kit R&D.

I drew inspiration from this design; it also includes accompanying code that might interest you: https://www.hackster.io/reductalimenitis/lotp-robot-dog-v2-73384f

Tip: Their modules are compatible thanks to their identical dimensions—just like on my robot dog!

If you run into any issues, feel free to send me a message.

If your print was successful, please share your thoughts—positive or negative, whatever you’d like—with a photo of your finished creation.

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