I made this basic 2 colour coaster with hearts.

The colours are Dark red on the bottom and on the outer ring and Pink on the heart decor.

The photo is a successful test print though the final model has a few minor changes.

The model is best printed with ironing on top surfaces and 4 top and bottom layers the rest can be changed on your requirements.

You don't need to print in two colours if you don't want the project file can be edited or you can use the RAW stl file