openscad incuadora

difference(){
    //--estructura principal
union() {
    //--techo
 translate ([-80,-30,70])
    cube ([140,60,2 ]);
    //--repisa 3 piso
    translate ([-80,-30,30])
    cube ([140,60, 2]);
     //--REPISA DE LA MITAD 2 PISO
   translate ([-80,-30,0])
    cube ([140,60, 2]);
    //--repiisa inferior
translate ([-80,-30,-70])
      cube ([140,60,2 ]);
    //-- pared trasera
  translate ([-80,30,-70])
    color("orange")
    cube ([140,4,142]);
    //-- pared lado  izquierdo
      translate ([-80,-30,-70])
    color("orange")
    cube ([2,60,142]);
    //-- 2 pared  lado  izquierdo  mas  derecho de bajo
    translate ([-55,-30,2])
    color("orange")
    cube ([2,60,68])
        //-- 2 pared  lado  izquierdo  mas  derecho de arriba
    translate ([-62,-30,30])
    color("orange")
    cube ([2,60,30]);
}
//--desparision de una esquina
translate([60,-30,-72])
rotate([0,0,75])
    cylinder (r =20/2  , h =144,$fn=3);
}
//--pilar de  lado derecho
module modulopilar() {
 color("orange")
translate([60,-23,-70])
rotate([0,0,225])
   cube ([10,2,142]);
translate([44.5,-32,-70])
     color("orange")
cube ([10,2,142]);
translate([60,-23,-70])
rotate([0,0,90])
     color("orange")
   cube ([10,2,142]);
    }
    modulopilar();
            //-- repisa 2
    translate ([-80,-30,15])
    cube ([26,60,2]);
    //-- repisa  4
    translate ([-80,-30,45])
    cube ([26,60,2]);