Coaster Non-skid Pad

Downloaded a set of coasters from here for my wife. She likes them, problem is printing them in PLA or any straight up plastic means they will or have the potential to slide. So, to solve that problem, I created these pads that can easily glued to the bottom of anything, in this case, coasters.   They are .6mm thick, so three layers essentially with a .2 layer height. They have slight ridges at 10mm offsets for grip. After testing, they work really well. Diameter is 95mm.   I printed in TPU, as there is really no point in printing a pla non-skid pad for a pla surface :)