I saw a cool looking coaster in one of those nice setup pictures. I designed it and printed it for my office mug :) I like the optical illusions it creates. Sometimes it even looks like a 3D Cube.

It prints very nice and fast with a 0.6 mm Nozzle, 2 perimeters and just gap infill. With a standard 0.4 nozzle, you have to increase the perimeters or use normal infill