//cube(5, center = true);
//cylinder(10, 4, 4, center = true);
//rotate([90, 0, 0])cylinder(10, 4, 4, center = true);
//rotate([90,90, 90])cylinder(10, 4, 4, center = true);

//rotate([90, 0, 0])cylinder(10, 2, 2, center = true);
   // rotate([90,90, 90])cylinder(3, 2, 5, center = true);
sphere( r = 2,5, d = 5);
difference (){
    cube(5, center = true);
    cylinder(10, 2, 2, center = true);
    rotate([90, 0, 0])cylinder(10, 2, 2, center = true);
    rotate([90,90, 90])cylinder(10, 2, 2, center = true);
}