include <BOSL2/std.scad>
include <BOSL2/screws.scad>
d1 = 80;
d2 = 10;
h = 30;
t = 5;

thread = "";

$fn = 360;
$slop = 0.3;

difference() {
    cyl(h=h, d=struct_val(screw_info("M6"),"diameter") + 2);
    // thread
    screw_hole(spec="M8", l=100, thread=true);
}

difference() {
    cyl(d1=d1, d2=d2, h=h);
    screw_hole(spec="M8", l=100, thread=true);
    for(i=[0:3]) {
        zrot(120*i) left(d1/3) cyl(h=h+1, d=d1/2);
        zrot(120*i + 30) left(d1/2) cuboid([20,10,100]);
        zrot(120*i - 30) left(d1/2) cuboid([20,10,100]);
    }
    // cyl(d1=t*(d2-d1)/h + d1 - 2*t, d2=(h-t)*(d2-d1)/h + d1 - 2*t, h=h-2*t);
}