Heart Coaster with customize-able infill pattern, and separate insert pieces that can also be printed in different colors.

Printing suggestions.

Layer height = 0.2mm

Color change recommended at layer 5 (but not required)

Print the coasters with 4 bottom layers and ZERO top layers.

Change the infill and density to what ever you would like.

For the Inserts 

layer height = 0.2mm

4 bottom layers, 5 top layers

Gyroid infill at 10%

The heart is symmetrical so you can insert the inserts upside down if you like.  Looks shiny if using a smooth build plate.

I have a tolerance designed into it of 0.07mm so this should fit using any printer.  If you have any issues with fitment, let me know and i can adjust and upload new model.