This is a checkers piece designed to fit properly on a tournament-sized chess board with a 57mm (2.25 in) square size. I found that standard checkers were too small relative to a full-size chess board. This checker piece is 75% of the square size, to give the proper feng-shui relative to the board size. All of the existing stl files I found were not printable without supports. This one is designed to be easily printable without any supports. It is stackable both ways. (bottom to top, or top to top.)