These Coaster holders were designed specifically to hold the coasters I made, but the square one should hold coasters that are about 4" and the round one should hold coasters that are about 4.3" in diameter. The cutouts on the sides make it easier to grab the coasters and make for using less filament.

The circle one and the shorter square one can hold about 1/2" worth of coasters (or 4 of my frame coasters/4 of the cabin coasters). The taller square coaster holder has about .8" of space or holds about 7 of my square coasters

You can resize these in the slicer to fit your coaster size and height.

Round Ornate Frame Coasters

Camping/Cabin Coasters

Fine Art Coasters