Parametric tiled hexagons in scad

hexagon_tile.scad

outer_hex = 1;
inner_hex = .9;
wall_depth = outer_hex - inner_hex;
tile_height = .5;

module hexagon(x) circle(r=x, $fn=6);
module hollow_hex(x, inner_x) difference(){hexagon(x); hexagon(inner_x);}
module hex_cylinder(height=0.1) linear_extrude(height=height, center=true) hollow_hex(outer_hex, inner_hex);

bump_y_vec = [0,(outer_hex * sqrt(3))-wall_depth/2,0];
bump_x_vec = [outer_hex * sqrt(2),0,0];


module hex_column(n) {
    union() {
        for (i =[0:n-1]){
            translate(i * bump_y_vec) hex_cylinder(tile_height);
        }
    }
}

module hex_grid(n, m) {
    union() {
        for (i = [0:2:m-1]) {
            translate(i*bump_x_vec) hex_column(n);
        }
        for (i = [1:2:m-1]) {
            translate(i*(bump_x_vec) + bump_y_vec/2) hex_column(n);
        }
    }
}
hex_grid(10,10);