// upper version  non - invert, negative resist

module slope (L, H, W, D) {

  translate([ -W/2, -D * 2, 0])   cube([ W, D, H]);
  translate([ -W/2,  D + L, 0])   cube([ W, D, H]);

  polyhedron(
      points = [
             [ -W/2,  0 , H],
             [  W/2,  0 , H],
             [  W/2,  L , 0], 
             [ -W/2,  L , 0], 
                       
             [ -W/2,  L , H], 
             [  W/2,  L , H], 
             ],
      faces  = [
             [ 0, 1, 2, 3],
             [ 3, 2, 5, 4],
             [ 4, 5, 1, 0],
             [ 0, 3, 4],
             [ 1, 5, 2]
             ]
             );
}

module slopex2(L, H, W, D, GAP) {

//                   x       y  z
translate([  W/2 + GAP,  - L/2, 50 ]) rotate([0, 180,   0]) slope (L,  H, W, D); 
translate([ -W/2 - GAP,    L/2, 50 ]) rotate([0, 180, 180]) slope (L,  H, W, D); 

}
//       Length, Height, Width, shift, gap

slopex2 (300,        50,   100, 50, 10);%