I needed a drink coaster for my GTR. This is a three color print using Prusa Slicer color change tool. Print the base in a solid color (I used SILVER) and then print the top face down on the build plate. Use supports “build plate only”. Start with Red then change the color to BLACK followed by the base color (SILVER). Print @ .2mm/layer.

Avoid hot drinks unless you use a high temp filament. I used PETG for one and it worked great.

The coaster is in two parts so that you can empty any condensation and for cleaning.