It is a 3 colour print, using simple method, you don't need any fancy tools, just ad a colour change on Prusa slicer on 4.2mm and 5.2mm or change the filamwent on these hight if you using 0.2 layer hight.

On the picture it is a 300mm wide clock, when you using the smaller version use smaller clock hands, The smaller version printable on a mk3s without brim.

For clock mechanism use a cheap one from amazon with a long shaft (15mm) might fit a normal shaft, never tried.

clock thickness 6mm

Don't make a same mistake as I did, don't use concentric for top infill. Hilbert curve will give you a better top finish.

Happy printing!