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<highlightSyntax language="c">

module a() { rotate (90) difference() {

     cube([40,40,5]);
    union() {
       translate([20, 20, 0])
         cylinder(h = 50, r = 19);
       translate([36, 4, 0])
         cylinder(h = 50, r = 1.6);
       translate([4, 36, 0])
         cylinder(h = 50, r = 1.6);
       translate([4, 4, 0])
         cylinder(h = 50, r = 1.6);
       translate([36, 36, 0])
         cylinder(h = 50, r = 1.6);
       }
  }

}


module kneif()

{


               difference()
                        {
                       translate([0,0, 0])
                               cube([20, 10, 20]);
                       translate([17,5, -5])
                               cylinder(h = 50, r = 1.6);
                          translate([10,2.5,2])
                                cube([12, 5,2.4]); 
                       rotate(a = 90, v = [1, 0, 0]) 
                               {
                               translate([6,10, -45])
                                       {
                                               cylinder(h = 50, r = 3.9);
                                       translate ([0,-3.9,0])
                                               cube( [18.4,(3.9*2),50]);
                                       }
                               }
                       }


} a(); rotate(a = 270, v = [0, 1, 0]) translate([0,0, 40]) kneif(); rotate(a = 270, v = [0, 1, 0]) translate([0, 30, 40]) kneif();


</highlightSyntax>