r=10;
d=5;
d1=2;

difference(){
cylinder(10,r=r+5,center=true);

union()for (i=[0:10])let(j=i+1){
  hull(){
    rotate(i*3)translate([r,0,-i/10])cylinder(1,d=d);
    rotate(j*3)translate([r,0,-j/10])cylinder(1,d=d);
  }
  hull(){
  rotate(i*3)translate([r,0,-i/10])cylinder(20,d=d1);
  rotate(j*3)translate([r,0,-j/10])cylinder(20,d=d1);
  }
  translate([r,0,0])cylinder(20,d=d);
}


if($preview)translate([r,0,-10])cube(50);
}