Recently wanted to design a simple Cold beverage Coaster for Beer or Soda, and also since a lot of people have 3D printers, I figure maybe you also would want to print one for your self.
Link provided below.
https://www.thingiverse.com/thing:7402634
If you lack a 3D Printer and would like to order some, Contact me and I will tell you which colors I have available and price/shipping.
YouTube video of the design idea behind my coaster is here –