D20 coasters, a must for Dungeons and Dragons game nights!
Looking for a matching holder? Check out user Yami86's model:
https://makerworld.com/en/models/1572531-d20-coasters-holder#profileId-1654111

Size
Ø85mm
Total thickness 2.4mm
Thickness up to pattern 2mm

Settings

0.2mm layer height
2 walls
Total of at least 12 top and bottom layers to make it solid (this is recommended for a smooth ironing result)
Monotonic lines pattern
Ironing
Add a colour change at 2mm if you want it dual colour.