This thing is a checkerboard. I have also included checkers, and arranged them so that you can print half red and half black. If you don't know how to play checkers, http://boardgames.about.com/cs/checkersdraughts/ht/play_checkers.htm has all the rules. Also, please look at the instructions to find out how to print this thing. This thing was made in OpenSCAD with the following code: Board: cube([42,42,1]); translate([1,1,1])cube([5,5,1]); translate([11,1,1])cube([5,5,1]); translate([21,1,1])cube([5,5,1]); translate([31,1,1])cube([5,5,1]); translate([1,11,1])cube([5,5,1]); translate([11,11,1])cube([5,5,1]); translate([21,11,1])cube([5,5,1]); translate([31,11,1])cube([5,5,1]); translate([1,21,1])cube([5,5,1]); translate([11,21,1])cube([5,5,1]); translate([21,21,1])cube([5,5,1]); translate([31,21,1])cube([5,5,1]); translate([1,31,1])cube([5,5,1]); translate([11,31,1])cube([5,5,1]); translate([21,31,1])cube([5,5,1]); translate([31,31,1])cube([5,5,1]); translate([5,6,1])cube([5,5,1]); translate([16,6,1])cube([5,5,1]); translate([26,6,1])cube([5,5,1]); translate([36,6,1])cube([5,5,1]); translate([5,16,1])cube([5,5,1]); translate([16,16,1])cube([5,5,1]); translate([26,16,1])cube([5,5,1]); translate([36,16,1])cube([5,5,1]); translate([5,26,1])cube([5,5,1]); translate([16,26,1])cube([5,5,1]); translate([26,26,1])cube([5,5,1]); translate([36,26,1])cube([5,5,1]); translate([5,36,1])cube([5,5,1]); translate([16,36,1])cube([5,5,1]); translate([26,36,1])cube([5,5,1]); translate([36,36,1])cube([5,5,1]); Checker pieces: union() { difference() { cylinder(3,4,4); cylinder(1,3,3); translate([0,0,2])cylinder(1,2.5,2.5); translate([-0.5,0,2])cube([10,1,1]); } cylinder(1,2,2); translate([0,0,2])cylinder(1,1.5,1.5); }To print this thing, you should print it in 3 steps.