UPDATE: Added raised surface with fillets (both 1mm and 2mm heights) to account for adhesive properties of condensation on a cup/glass/can to avoid lifting the coaster when picking up.

All Gridfinity coasters I've seen have had some manner of cup cutout that may not fit my cups… so a blank slate that should fit most cups.

Included the original model with a flat surface in both magnet and non-magnet versions as well as the newly added with raised ribs to allow condensation to pool at the base and avoid lifting.

Should you print many, they will stack on top of one another.