I drew this up in F360, then used Cura with a brim printed on a SW2 with kodak black pla. you might need to use your own judgment for other setups. The Glass is 3-1/4" diameter, I drew this coaster oversize so it looks like 1/8"clearance larger glasses may fit ok. I debated filleting all the edges, but I decided a flat top is justfine. You could import & add fillets.