This is a stackable checker.    Print it with the required supports.  The ones in the print profile are designed to easily remove from this model by just pushing each of the 5 support tabs away from the part, and the support structure will come off in one piece.

This print profile doesn't use infill, so the checkers feel weighty.

16 fit on a single A1 mini build plate.    Print the plate twice with two different colors.   

There's a .stp file if you want to make easy changes.