difference() {
        translate([0, 0, 2])
            cube(30, true);
        translate([0, 0, 2])
            cube([25, 25, 31], true);
        translate([0, 0, 2])
            cube([25, 31, 25], true);
        translate([0, 0, 2])
            cube([31, 20, 28], true);
    }
   union(){
      rotate([50, 0, 0])
       translate ([5, 0, 1.5])
      difference() {
         translate([15, 0, 0])
            cube(30, true);
        translate([15, 0, 0])
            cube([25, 25, 31], true);
        translate([15, 0, 0])
            cube([25, 31, 25], true);
        translate([15, 0, 0])
            cube([31, 20, 28], true);
    
    }
    }