Engine Fidget - Mazda 13B dual rotor rotary engine

🏎️ 13B Dual-Rotor Rotary Engine Model

Bring the legendary "Dorito Power" to your desk! This is a meticulously designed 13B Dual-Rotor Engine model, inspired by the iconic Mazda rotary powerplant. Whether you are a JDM enthusiast or a mechanical geek, this model is a must-print.

🌟 Key Features

• True Dual-Rotor Mechanics: Unlike single-rotor designs, this model features the full Dual-Rotor setup, accurately showcasing the offset timing and the unique geometry of the 13B.
• Ultra-Smooth Motion: Engineered with optimized tolerances. The rotors glide through the epitrochoid housings with satisfying smoothness, perfectly capturing the "spin" that rotary fans love.
• Compact & Desk-Friendly: Designed to be space-efficient. It’s the perfect size for an office fidget toy or a teaching tool without taking up your entire workspace.
• Optimized for 3D Printing: Print-tested for minimal support and easy assembly. No complex hardware is required to get it spinning!

⚙️ Assembly Instructions (Please READ IT CAREFULLY)

• Slide four long bolts through one X-shape bearing fixture and place it on the table.
• Slide one housing through.
• Put one rotor in the housing, make sure the gear side down. Rotate the rotor to make sure it can follow the inner path spinning freely.
• Assemble the accentric shaft and make sure the two ends at 180 deg. GLUE THEM IN THE MIDDLE!
• Put the center on and wiggle+rotate+install the shaft so that it will align with the installed rotor.
• Put on the second housing together and rotor. MAKE SURE THE SECOND ROTOR CAN SPIN FREELY! This is very important, otherwise your rotor might get stuck under high RPM.

• Tigh the four nuts then install bearings on sides. You can use MR148 steel bearing or use mine print file:

  https://makerworld.com/en/models/1088520-8-14-4-bearing#profileId-1081576

• Put on fr and rr nuts. If you have M3 screws, you can tight through the holes. Just make sure they wont press the X-rack too tight. DONE

⚙️ NOTE:

• Clean your bed and make sure decent adhesion. 
• Different filament has different shrinkage, you may need sand the nut/bolt a bit to make sure they work smoothly. i have printed two engines and no problem.
• Any questions let me know. 

💡 Why Download This?

The 13B is a masterpiece of engineering, known for its high power density and unique soul. This model simplifies that complexity into a tactile, visual experience. It’s a great conversation starter and a rewarding project for any maker.

If you enjoy this design, please leave a Like, Download, and a ⭐️⭐️⭐️⭐️⭐️ rating! Your support helps me keep creating and sharing more mechanical wonders!