Thirstystone coaster protective edges

thingiverse

I draw up a design for 4" thirstystone coasters, about 3/8" thick, after my cats repeatedly knock everything off every surface and chip around the edges of my thirstystone coasters, beating them up on the floor. It's a bit fiddly to get the threads started, but once it starts, the screws down nicely, providing some protection for my thirsty stones.