This is a cart coin with a projetion of the earth's surface on it. One side features the southern hemisphere and the other the northern. I used the azimuthal equidistant projection for the two hemispheres. Diameter and thickness match those of a 1€ coin.

Printing

Colors

If you have an AMS or similar multicolor device, you can use that to print continents and polar regions in different colors. (I've uploaded a BambuStudio file for that). If you don't have one that doesn't also matter. There is a unicolored version for which the continents are recessed into the coin.

Quality

I'd recommend printing this coin with a 0.2mm nozzle. 0.4mm also works, but you will loose a lot of detail (aseptically the smaller islands).