Spill resistant coaster

Yesterday, suffering from an **extreme** case of the dropsies I spilled a glass of wine and a glass of water on my desk within 5 minutes of each other. (It was the first glass of wine - no I was _not_ drunk, just clumsy). That inspired this coaster with raised sides to reduce the likelihood of a small accidental bump from becoming a wet desk.

I designed it in ViaCAD and have uploaded the source as well. I think next I'll make a variation that has an opening for a mug handle.