use beam_width = 7.9375; // 5/16 inches projection(cut=true) { difference(){ // Base plate cube([8*9, beam_width * 9, 1]); // Bottom row for (x=[8 : 8 : beam_width * 10]) { translate([x-4, beam_width/2, -10]) cylinder(r=2.4, h=20, $fn=25); } // Top row for (x=[8 : 8 : beam_width * 10]) { translate([x-4, (beam_width/2) + beam_width * 8, -10]) cylinder(r=2.4, h=20, $fn=25); } translate([17,60,0]) MountingHoles(); } } // Uncomment next line if you want to see the entire board //translate([17,60,2]) Arduino();