This is a woven cubic lattice. There are 3x of the single weave printed-in-place. It is meant as an art piece but can be used as a coaster. It is a bit wide for a coaster. I recommend using a matte black filament but I'd love to see other options!

Included is the .stl of the 3x weave and an .stl of the single weave. 

I sunk the model into the buildplate ~2.5mm to allow for easy printing. If you want you can raise the .stl higher for a cleaner look on the bottom at the risk of print stability.