include <yenyalib.scad>

base_wall = 4;
wall = 1.5;
rod_d = 5 + 1;
d_max = 45;
d_min = 20;
steps = 3;

strut_w = 15;
strut_l = 80;
strut_side_inner_l = 8;

center_hole_d = d_min-wall-rod_d;

module base() {
	difference() {
		cylinder(r = d_max/2+2*wall + rod_d/2, h = base_wall, $fn = 6);
		Tz(wall) cylinder(r = d_max/2 + rod_d/2+wall, h = base_wall, $fn = 6);
	}
}

module strut() {
Ty((d_max/2+wall+rod_d/2)*cos(30)) {
	Tx(-strut_w/2) {
		cube([strut_w, strut_l, wall]);
		Ty(strut_l-wall) difference() {
			cube([strut_w, wall, strut_w]);
			Tx(strut_w/2) Tz(strut_w/2) Rx(-90) Tz(-eps) cylinder(r = 2.5, h = wall+2*eps, $fn = 6);
		}
	}
	Mx() hull() {
		Tx(strut_w/2-wall) {
			Ty(-strut_side_inner_l) cube([wall, eps, base_wall]);
			Ty(strut_l-wall) cube([wall, wall, strut_w]);
		}
	}
}
}
difference() {
	union() {
		base();
		strut();
	}
	for (i = [0:1:steps]) {
		Rz((steps-i)*85/steps)
		for (angle = [0:60:360]) Rz(angle) Tx(d_min/2+i*(d_max-d_min)/(2*(steps))) Tz(-eps)
			cylinder(r = rod_d/2, h = wall + 2*eps, $fn = 6);
	}
	Tz(-eps) cylinder(r = center_hole_d/2, h = infty);
}