***Would print this in something that can stand up to the heat in your car. Probably ABS. Do research and see what you need to print with.

Highland Cow car coasters. These are 2.75 inches. Printed facedown for a nice finish.  I backed these with cork.

I also have Highland Cow coaters with a holder for the home. https://makerworld.com/en/models/499691#profileId-414471