Cad Exercises - Doo-ha

Revisiting Cad Exercises

difference(){
    union(){
            translate([0,0,-10])cylinder(80,25,25);
            translate([0,0,-10])cylinder(96,17.5,17.5);
intersection(){
linear_extrude(40,convexity=20){
                    P();
    mirror([0,1,0]) P();
}
translate([40,0,20])rotate([90,0,0])

cylinder(90,70,70,center=true,$fn=60);
}
        }
            translate([0,0,-20])cylinder(120,10,10);
translate([90,0,20])rotate([90,0,0])

cylinder(100,6,6,center=true,$fn=60);

}
module P()
{
 polygon([
        [0,0],[35,0],[35,15],
        [75,15],[75,35],[110,35],
        [110,45],[65,45],[65,25],
        [25,25],[0,25]]);
}