Some simple coasters I made for a friend a while back, thought I may as well upload them. The full set consists of 6 coasters and the holder.

-whilst PLA certainly has the potential to deform under the heat of a hot cup of coffee, in practice, iv found it doesn't really do any damage in normal use, unless you pick the coaster up and start bending it whilst its still warm. Naturally they wont survive a trip through the dishwasher… The geometry is so simple however you shouldn't have any trouble printing them in whatever material you like!

The example prints pictured were just black PLA with the holder printed in Overture slate grey rock PLA.