Fixed screw hole

[ollie-d]

Previous code had the screw hole height hard-coded to 10mm. This fix utilizes the head_height variable to create a hole for any shaft height.

[hugokernel]

Nice, but you can simplify the fix like that:

    difference() {
        translate([0, 0, 0.1]) {
            cylinder(r = head_diameter / 2 + head_thickness, h = head_height + 1);
        }

        cylinder(r = head_screw_diameter / 2, h = head_height * 2);

        servo_head(params);
    }