size=20;
t=2;


for(i=[0,1,2]) {
  rotate([0, 0, i*120]) translate([size,0,0]) cylinder(h=100, d=2);
  for(j=[0:20:100]) {
    rotate([0, 0, i*120]) translate([size,0,j]) rotate([90,0,-60]) cylinder(h=size*sqrt(3));
  }
}