This is a coaster made to resemble metal wires going around rods. There are two designs included plus the base; one with flat bottom and one with mirrored sides (like the one you see in pictures). Flat bottom is easier to print and will take less time but mirrored sides one looks and feels better.

If printing mirrored sides one make sure you have great bed adhesion and slow down first 6 layers as there will be a lot of objects not connected to each other. If all fails use brim but then you're looking at some annoying post processing.