Made a quick Caffeine Molecule Coaster on Tinkercad using Quaky font and a .png of a caffeine molecule converted into an .svg for use in the program

The coaster is a large 10cm diameter, and 8mm tall. It features a groove to catch fluids so you can pick up the coaster and carry it to the sink to wash without spilling on other surfaces if you knock your cup. The outer lip is raised to make it easy to move the coaster and cup at the same time by pulling or pushing it with your cup.

I will also post a version to print a mold out of TPU or TPE for cement coasters very soon - this coaster was designed with that end goal in mind.

If you want to see other molecules on coasters or otherwise, send a request.