$fn=60;

difference() {
	cube(20, center=true);
	sphere(d=19);
	rotate([0,0,0]) cylinder(d=15, h=30, center=true);
	rotate([0,90,0]) cylinder(d=15, h=30, center=true);
	rotate([90,0,0]) cylinder(d=15, h=30, center=true);
	translate([0,-10,0]) rotate([0,45,0]) translate([0,0,20]) cube([40,1,40], center=true);
	translate([10,00,0]) rotate([45,0,0]) translate([0,0,20]) cube([1,40,40], center=true);
}