$fn=360;
use </home/pelu/Nextcloud/oc.ludikovsky.name/Privat/3D Druck/lib/threads.scad>;

difference(){
    union(){
        cylinder(d=18,h=17,center=true);
        translate([0,0,8.5])
            resize([34,34,4])
                linear_extrude(h=4, center=false, scale=0)
                    circle(d=34,center=true);
    }
    cylinder(d=14,h=30,center=true);
}

translate([0,12,8.5])
    minkowski(){
        linear_extrude(2)
            square([0.5,6],center=true);
        cylinder(h=2,d=0.5);
    }
    
translate([0,-12,8.5])
    minkowski(){
        linear_extrude(2)
            square([0.5,6],center=true);
        cylinder(h=2,d=0.5);
    }

translate([12,0,8.5])
    rotate([0,0,90])
    minkowski(){
        linear_extrude(2)
            square([0.5,6],center=true);
        cylinder(h=2,d=0.5);
    }
    
translate([-12,0,8.5])
    rotate([0,0,90])
    minkowski(){
        linear_extrude(2)
            square([0.5,6],center=true);
        cylinder(h=2,d=0.5);
    }


translate([0,0,-7.5])
difference(){
    cylinder(d=14, h=6);
    metric_thread(diameter=14, length=6, pitch=3, thread_size=3, internal=true);
}