Engineer Replaces a Bicycle Chain With a Series of 3D-Printed Gears

Lori Dorn
February 4, 2026

Sergii Gordieiev of The Q, who enjoys tinkering around, used his mathematical and engineering skills to build a chainless bicycle drivetrain using a series of connected 3D-printed gears to replace the conventional chain.

In this video, I build a fully working chainless bicycle drivetrain powered by a series of gears – and all system was 3D printed.

Lori Dorn

Lori is a Laughing Squid Contributing Editor based in New York City who has been writing blog posts for over a decade. She also enjoys making jewelry, playing guitar, taking photos and mixing craft cocktails.