//-- Node4-y1

 L=dxf_dim(file = "node4-plate.dxf",name="L");

module node4(W,l) {
  xd = dxf_dim(file = "node4-plate.dxf", name = "xd");
  yd = dxf_dim(file = "node4-plate.dxf",name= "yd");

  module drill() {
    rotate(a=90, v=[1,0,0])
      translate(v=[xd,yd,0])
        cylinder(h=90, r=3, center=true);

    rotate(a=90, v=[1,0,0])
      translate(v=[-xd,yd,0])
        cylinder(h=90, r=3, center=true);

    rotate(a=90, v=[1,0,0])
      translate(v=[-xd,-yd,0])
        cylinder(h=90, r=3, center=true);

    rotate(a=90, v=[1,0,0])
      translate(v=[xd,-yd,0])
        cylinder(h=90, r=3, center=true); 
  }

  module interior() {
     rotate(a=90, v=[1,0,0]) 
       linear_extrude(file="node4-plate.dxf", layer="interior", height=L+2*W+10, center=true);
  }

  module bevel_edge() {
     translate([L/2+W, L/2+W, 0])
     rotate(a=-45, v=[0,0,1])
     cube(size=[l+10, l, L+10],center=true);
  }


  difference() {
     //-- Initial hexahedron
     cube(size=[L+2*W,L+2*W,L], center=true);

     //-- substract the inside
     cube(size=[L,L,L+10], center=true);

    //-- Create the interior of the y axis sides
   interior();

   //-- Create the interior of the x axis sides
   rotate(a=90, v=[0,0,1])  interior();

    //-- Drills on the y-axis side
    drill();
     //-- Driss on the x-axis side
     rotate(a=90,v=[0,0,1])    drill();

    //-- Remove the edges
   bevel_edge();   
   rotate(a=90,v=[0,0,1]) bevel_edge();
   rotate(a=180,v=[0,0,1]) bevel_edge();
   rotate(a=-90,v=[0,0,1]) bevel_edge();

  }
  
  
}

//-- Locate the piece on the z=0 plane
translate([0,0,L/2])
  node4(4,4);