These are two models, a ' positive' and 'negative' file. The print in the picture is the negative one. If you print it for a drinkcoaster, i would print the negative one. Cause that one provides more stability for your glass/cup.
Print it with a single or multiple color, with filament or resin..and show me what you guys have made of it.
This is a standard size coaster (100 by 100 by 5 mm), to fit in my coasterholder: