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That's great to hear. My son and I built our first 3D printer when he was 10. He's now in his first year of college, studying mechanical engineering.

There is a YouTube channel called, "This Old Tony". He just posted a new video where he explains how gears work and how to make them. It's pretty good.
Here is the link: https://youtu.be/Q-XOM4E4RZQ

I plan to make a YouTube video about the Math Gear(s) project soon. My channel: https://www.youtube.com/worksbysolo

I'll check out your video later today.

Thanks for messaging me!

P.S. There is a newer version of Math Gear(s) on my web site.
no major difference in functionality. The gears print a bit more efficiently, and it's optimized for people that have impaired vision. Here's the link: https://www.worksbysolo.com/free3dmodels/

-- Bernie Solo