Simple Octagon Coaster - 2 parts

IMPORTANT - print the base with 101% to have a perfect fit. Only if your printer is high precision you can try to do both models on 100%. 

This Model is very simple. Print it in different colors as you like. 

I printed this  up to 0.3 layer height with 0.4mm nozzle. Put rubber underneath as you like to give it a better stand on the surface.