$fn = 128;

module cylinder_with_champfer(d, h){
       rotate_extrude(angle=360)
       polygon([
              [0, 0],
              [0, h],
              [d/2-1, h],
              [d/2, h-1],
              [d/2, 0],
       ]);
}

module stand(){
       difference(){
              cylinder_with_champfer(d=100, h=25);
              translate([0, 0, -2]) cylinder(d=13, h=30);
       }
}

module holder_pin(){
       difference(){
              union(){
                     translate([0, 0, 5]) sphere(d=12.4);
                     translate([0, 0, 5]) cylinder(d=12.4, h=40);
                     translate([0, 0, 13]) cylinder(d=30, h=4);
                     translate([0, 0, 17]) cylinder_with_champfer(d=24.6, h=16);
                     translate([0, 0, 13+17]) cylinder_with_champfer(d=19.6, h=14);
              }
              // Hole to stack them
              translate([0, 0, 45-17]) cylinder(d=13, h=18);
       }
}


stand();

translate([0, 74, 0]) holder_pin();
translate([40, 64, 0]) holder_pin();
translate([-40, 64, 0]) holder_pin();

translate([0, -74, 0]) holder_pin();
translate([40, -64, 0]) holder_pin();
translate([-40, -64, 0]) holder_pin();