This requires a multi-material printer.Use the smart filling tool in PrusaSlicer to fill in the colors on all parts of the model of the national flag. Print the coaster base using TPU.

Coasters with the Puerto Rican flag. Size: 3.75 inches

I'm selling these sets here:

https://www.etsy.com/listing/1388898465/drink-coasters-puerto-rico-flag-set-of-4