This is a modification of a model by Hawk.  This can be used for many different game designs.  I added empty space to the center of the tiles to save on material and print time.  The unintended benefit is that the center empty space is 1.5 inch.  That might be useful if you want to drop in tokens with bases of 1.5 inch.  The whole tile is 2 inch and can  hold 2 inch cardboard tiles with a little wiggle room.  The interlocking is not perfect, but better than nothing.  PETG recommended.