Grille for Adafruit aluminum coasters

Adafruit gives out aluminum coasters with large orders.  They're very nice, but they stick to the condensation on the bottom of a cold glass.  This grille breaks up the coaster's top surface so your glass won't stick.

I modeled this in Fusion 360.  I've included the .f3d file and .STEP file, so start with one of those if you want to redesign it.  Please do redesign it; my pattern is okay, but I know you could come up with something better.

Printing Instructions

I've printed this in PLA, PETG, ASA, and ABS.  They all work fine.  The model is optimized for 0.2mm layer height.  I used the default 2 perimeters and 15% grid infill; I'm sure other values would work too.