$fn=96; 


difference () {
cylinder(d=56.0, h=3);

translate([0,0,-2])
cylinder(d=40, h=8);
}

difference () {
translate([60,0,0])
cylinder(d=56.0, h=2.5);

translate([60,0,-3])
cylinder(d=40, h=10);
}

difference () {
translate([120,0,0])
cylinder(d=56.0, h=2.0);

translate([120,0,-3])
cylinder(d=40, h=10);
}

difference () {
translate([0,60,0])
cylinder(d=56.0, h=1.5);

translate([0,60,-3])
cylinder(d=40, h=10);
}

difference () {
translate([60,60,0])
cylinder(d=56.0, h=1.0);

translate([60,60,-3])
cylinder(d=40, h=10);
}

difference () {
translate([120,60,0])
cylinder(d=56.0, h=3.5);

translate([120,60,-3])
cylinder(d=40, h=10);
}