Slate Coaster Display Holder

Was looking for something to display slate 4 inch coasters that were engraved. Wanted something that would display them and be functional to hold the. 100% size fits square slate coasters and 80% size fits the round ones. Printed at 10% infill to save a little time and filament but can be changed to your liking. 100% is a 5 inch by 5 inch by 1 inch thick. 80% is roughly 4 inch by 4 inch at 1 inch thick.