Honeycomb

I want to make something that looks like this.
http://www.thingiverse.com/thing:321880

here is the code:

module hc_hexagon(size, height) {box_width = size/1.75;
for (r = [-60, 0, 60]) rotate([0,0,r]) cube([box_width, size, height],
true);}

module hc_column(length, height, cell_size, wall_thickness) {
no_of_cells = floor(1 + length / (cell_size + wall_thickness)) ;
for (i = [0 : no_of_cells]) {
translate([0,(i * (cell_size + wall_thickness)),0])
hc_hexagon(cell_size, height + 1);}}

module honeycomb (length, width, height, cell_size, wall_thickness) {
no_of_rows = floor(1.75 * length / (cell_size + wall_thickness)) ;
tr_mod = cell_size + wall_thickness;
tr_x = sqrt(3)/2 * tr_mod;
tr_y = tr_mod / 2;
off_x = -1 * wall_thickness / 2;outer_walls = 10;
off_y = wall_thickness / 2;outer_walls = 10;

difference(){ cube([length, width, height]);
for (i = [0 : no_of_rows]) {
translate([i * tr_x + off_x, (i % 2) * tr_y + off_y, (height) / 2])
hc_column(width, height, cell_size, wall_thickness);}}}

//honeycomb(length, width, height, cell_size, wall_thickness);
honeycomb(80, 80, 5, 5, 1);