bike without chain still rides using a series of 3D printed plastic gears

"Sergii Gordieiev, the creator behind the channel The Q, revives a chainless bike by making it functional using a series of interconnected, 3D printed plastic gears. Interlocked in a row, the setup consists of a large gear and four mini ones. When the large one rotates, it transfers motion to the smaller gears, allowing for rotation and hence letting the chainless bike ride again even without its original chain."

"The creator uses the printed Phrozen Arco, which uses high-flow engineering nozzles that push the melted plastic quickly. Before that, Sergii Gordieiev makes sure that the design of each gear is aligned correctly so the chainless bike can work. If one gear slips, the system fails, but thanks to the 3D printer, the sizes of the gears are accurate enough for them to work just fine."

"In the video uploaded on Youtube, the creator is seen building the frame of the chainless bike to affix the 3D printed plastic gears. He measures them precisely, and rightly so, or else one of the gears could fall and hinder the bike's run. He tests the gears on a wooden slab and screws them onto it before trying it out on the part where the chain is supposed to be around."

A chainless bike was restored by replacing its missing chain with a series of interconnected 3D-printed plastic gears arranged in a row: one large gear driving four smaller gears. High-precision prints from a Phrozen Arco with high-flow nozzles produced accurately sized white plastic gears that were painted orange for visibility. Each gear was measured and aligned precisely, tested on a wooden slab, and screwed into a custom bike frame before installation. The mechanism requires exact alignment to avoid slippage, and the 3D-printed parts enable affordable, replaceable, and customizable components produced at home.

Read at designboom | architecture & design magazine