slider with 11mm screw

module carrito()

{



$fn = 90;
rotate(270, [0, 1, 0])
translate ([12.5,0,-25])

difference (){ //beginning og difference 2
union (){ //beginning of union 1
difference (){ //beginning of difference 1
//main cube
translate ([-12.5,-55,-2])
cube ([12.5,110,52]);

//hueco pa caja de bolas IZQUIERDA
translate ([-13,-40,35])
rotate(90, [0, 1, 0])
cylinder (h=7,r=11);
translate ([-13,-40,35])
rotate(90, [0, 1, 0])
cylinder (h=20,r=9.5);

//hueco