This is a square coaster, with some channels/layer differences to allow condensation to sweat out without the top becoming slick.
I used the chapter icon from the book series Wheel of Time for Mat (my favorite character), and created the 3d models. I didn't quite like how it all blended together in the 2-layer version so I created another with another layer for the shadows around the dice.
The one that's 2 layers, you can do a single color swap after 3mm of height, and the one that has 3 layers, you can do a color swap after 3mm, and one after 3.5mm.
You can of course print it as a single color as well.
The author marked this model as their own original creation.