countersunk screw

countersunk_screw.scad

//counter-sunk screw
//(standing upside down on its head)
//defaults are for 3x20mm torx screw
module countersunk_screw(
        l=20,   //total length (including head)
        dH = 6,  //head dia
        lH = 3,  //head length
        dB = 3.2, //bolt dia (with tolerance) 
        lS = 0   //support thickness if any (set this to layer thickness for upside down printing)
        )
{
    union() {
        //head
        cylinder(r1=dH/2, r2=dB/2, h=lH);
        //bolt
        translate([0, 0, lH+lS])
            polyhole(h=l-lH-lS, d=dB);
    }
}