Modern Bubble Coaster set, that includes 4 coasters and a coaster holder. Scale the design to whatever size you desire to fit your glassware.
 

Coaster

infill:15% 
Layer Height: .16mm

Support: None
Ironing Settings: Top surfaces, Pattern Rectangular, Speed 150, Flow 38%, Spacing .2, Insert .21

Coaster Holder
Infill: 15%

Layer Height: .16mm
Support: Tree Support needed in the overhang. Use manual and paint on. You do not need support for the lower ring section.