$radius = 50;
$branching = 5;

seed = rands(0, 123789, 1)[0];

module twig(length, branching) {
    translate([length/2, 0, 0]) cube([length, level/branching, 1], true);
    if(branching > 1){
        dist = 0.9 * length/branching;
        for(d = [0.1*length:dist:0.9*length]) {
            translate([d, 0, 0]) {
                p = rands(0, 1, 1, seed*d)[0];
                next_branching = rands(1, branching-1, 1, seed*d)[0];
                if(p > 0.8){
                    hexagon(length/12);
                } else {
                    s = (length - 0.5*d) / length;
                    rotate([0, 0, 60])  twig(s * length/4, next_branching);
                    rotate([0, 0, -60]) twig(s * length/4, next_branching);
                }
            }
        }
    }
}

module hexagon(size, height=1) {
    linear_extrude(height=height, center=true) {
        circle($fn=6, r=size);
    }
}

module keyhole(size=2) {
    difference() {
        cylinder(h=1, r=size, $fn=120, center=true);
        cylinder(h=1, r=0.8*size, $fn=120, center=true);
    }
}

module snowflake() {
    for(i = [1:6]){
        rotate([0,0,60*i]) twig($radius, $branching);
    }
    keyhole_size = max(min($radius, 1), 2);
    translate([$radius + 1.5, 0, 0]) keyhole(keyhole_size);
}

snowflake();