// -*- C -*-

opening_height = 7.84;
opening_depth = 7.88;
openingcnr_dia = 2.75;
opening_protrh = 1.8;

module ExtrusionSect(){
  cr = openingcnr_dia/2;
  toph = opening_height/2 + opening_protrh;

  for (my=[0,1]) {
    mirror([0,my]) {
      translate([cr/2, opening_height/2 + cr/2]) {
	hull(){
	  circle(r=cr, $fn=20);
	  translate([-cr,10]) square([cr*2, 1]);
	}
      }
    }
  }
  translate([-opening_depth, -toph]) {
    difference(){
      translate([-5,-5])
	square([opening_depth+6, toph*2+10]);
      square([opening_depth+2, toph*2]);
    }
  }
}

ExtrusionSect();