I designed this clock simply because I wanted one, and this is what I came up with. 

It is inspired by the starburst graphics popular in the Midcentury Modern era. 

I don't have AMS, so I just use a layer pause after the center area of the face tops out, and swap filament to make the numbers and outline a different color. the smallest inner points are an even lower height, so this could be printed that way with 3 different colors. 

The center hold is sized to fit a basic clock motor, I got mine off amazon, but there are loads of options. it prints to about 9mm in diameter.