In celebration of the wondrous Caffeine molecule, a coaster deserving of your morning brew.

Remixed ejo60 http://www.thingiverse.com/thing:618654 caffeine molecule and added coaster with anti warping brim (cut that away after printer).

CAD files at TinkerCad... https://www.tinkercad.com/things/dnxWoT2TZVa

Print in ABS or PLA ... consider bonding in molecule using acetone in ABS, or use white glue with PLA print.

The molecule should print with no warping. The Coaster shape is prone to warping, a wide cut-away brim is added to the STL model to prevent print bed warping adhesion loss.