The clock features a series of 3d-printed gears ... The hour and minute are indicated by two orange posts inside the large gears. [ekaggrat] etched his own PCB for the microcontroller and stepper ...

[shiura]’s Hollow Clock 3 is a fantastic 3D printed take on ... A concealed shaft and gear assembly takes care of that. For every full rotation of the minute hand (actually the white ring ...