// All dimensions are assumed to be given in millimeters

width = 2 * 3.175;
depth = 11;
diameter = 4.4;

for (i=[0:1]){
    translate(v=[i * (width + 2), 0, 0]){
        union() {
            cube([width, width, depth]);
            translate(v=[width/2, width/2, depth + 1.5/2]){
                cylinder(h=1.5, d=diameter, center=true);
            }
        }
    }
}