$fn=100;

difference(){
union(){
cylinder(h=3, d=14);
cylinder(h=7, d=9.9);
}

cylinder(h=8, d=8.1);
}

difference(){
cylinder(h=2, d=30);
    cylinder(h=2, d=26);}
    
  translate([30,0,0])  difference(){
union(){
cylinder(h=3, d=14);
cylinder(h=7, d=9.9);
}

cylinder(h=8, d=8.1);
}