The clock features a series of 3d-printed gears, all driven by a single stepper ... If you want to build your own, [ekaggrat] posted all of his design files on GitHub. All you need is a PCB ...

The clock uses an idler wheel to move the hour ring so it doesn’t need a separate hour hand. After he built his first design, [wyojustin] realized he could add a planetary gear that could move ...