This is my version of a 'MetaClock' using many analog clocks to display the time, write text or display different animations.
Details of the build are described in
https://mcuoneclipse.com/2020/06/07/behind-the-canvas-making-of-60-billion-lights/
and https://mcuoneclipse.com/2020/05/24/60-billion-lights-2400-rgb-leds-and-120-stepper-motors-hiding-behind-canvas-art/

Ultimaker

Ultimaker 2

No

No

0.2

15%

The parts can be printed in any color as not visible in the final design, except the rings behind the canvas: depending on your canvas color I recommend black PLA.