This module creates hexagons in a hexagon.
Parameters
radius: The radius of every hexagon.spacing: The length of the gap between hexagons.levels: How many levels if counting from the center?
Examples
use <hexagons.scad>
radius = 20;
spacing = 2;
levels = 2;
hexagons(radius, spacing, levels);
use <hexagons.scad>
radius = 20;
spacing = 2;
levels = 3;
hexagons(radius, spacing, levels);

