I Built My FIRST 3D Printed Gearbox, 729:1 Gear Ratio with ZERO Machining!🔥

Today, I’m thrilled to share something super special with you — the story of how I built my very first gearbox, featuring an insane 729:1 gear ratio — and all of it without any machining! 🚀

In this video, I’ll take you through a close-up look at my homemade gearbox project.
First, I’ll show you one of the compound gears I made, with a precise 60-tooth and 20-tooth combination. I’ll also demonstrate how the shaft fits perfectly into the gear hole, proving the incredible accuracy of this build — even though I didn’t use any special machining or advanced tools. It’s all about smart design and careful assembly! 🛠️

Then, we move on to the assembled gearbox. I’ll show you a fascinating phenomenon: the first gear moves effortlessly, while the final gear demands serious force to rotate. Why? That’s the magic of gear ratios in action! ⚙️

With six stages of 3:1 reduction, the final output ends up with a massive 729:1 gear ratio.
That means you need 729 turns of the first gear to make the final gear complete just one revolution — giving you incredible torque at the output!

I’ll also quickly explain the basic principle behind gear ratios and walk you through a fast calculation, so you can appreciate how powerful even a simple gearbox design can be.

This project was a blast to build and even more fun to share. Whether you’re into mechanical engineering, DIY projects, gears, gearboxes, or just love seeing how mechanical systems come together, this video is for you!

If you enjoyed the video, don’t forget to like, comment, and subscribe — and let me know if you want to see more cool mechanical builds in the future. I’ve got tons of ideas brewing! 😎

Thanks for stopping by, you could download the model from the link below, and see you in the next project!

STL: https://makerworld.com/en/@itssal3d

Chapters:
Start 0:00
Intro 0:05
Assembling 0:12
Gears 0:19
Gear Ratio 0:37
Gearbox Performance 1:18

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