Here is another clock face to go along with my CoffeeTime clock.
https://www.thingiverse.com/thing:3260433

If you have an existing clock, like a 300mm one, print this at 285mm diam, 2mm high, 0.2mm layers. This gives 10 layers total.

Add a pause between layer 7 and 8 to change the colour.

G1 F3600 X193.893 Y200.318 E2668.29466 <<< last line of layer 7

; begin layer pause code
G91 ; Put in relative mode
G1 Z10 ; Lower bed by 10mm
G90 ; Put back in absolute mode
G1 X0 Y0 ; Zero (home) the X & Y
M84 S0 ; Disable the stepper motor timeout
M0 WHITE then Click To Restart ; Pause and wait for the user
M84 S60 ; Reenable the default timeout
G91 ; Put in relative mode
G1 Z-10 ; Raise the bed back up 10mm
G90 ; Put back in absolute mode
; end layer pause code

;LAYER:8 <<<<<<< first line of layer 8.

https://www.tinkercad.com/things/06vw3rQREeP-beertime/edit

Wombot

No

No

.2mm

20%

This is printed 2mm thick and added in front of the existing dial face.
But, as for the original Coffee Time clocks, if you print it thicker, it can be used as the clock itself.

The one shown is for our friend, Trish, who runs the tavern at Wunghnu, Victoria, Australia.
I made 5 O'Clock stand out as "It Is 5 O'Clock Somewhere" to quote the song.

The tavern name has been added.