two polyholes (l1, d1 and l2, d2) stacked on top of each other, with optional support layer in between

stacked_polyholes.scad

//two polyholes (d1, h1 and d2, h2) stacked on top of each other
//can be used for modelling cutouts for cylinder head screws, bearings with axle bore etc.
//out of solid components
module stacked_polyholes(
        d1 = 5,   //first polyhole (bottom)
        l1 = 10,
        d2 = 10,  //second polyhole (stacked on top)
        l2 = 20,
        lS = 0   //optional support layer in betwenn (set this to layer thickness for upside down printing)
        )
{
    union() {
        //first at bottom
        polyhole(h=l1+de, d=d1);
        //2nd stacked on top
        translate([0, 0, l1+lS])
            polyhole(h=l2, d=d2);
    }
}