module my_cone( r=18.4 ){
    translate([0,0,30])
    difference() {
        cylinder(h=60,r1=r*2,r2=0.0, center=true, $fn=60);
        cylinder(h=60,r1=r,r2=0.0, center= true, $fn=60);
        translate([0,-(r*2),-30])
        cube([r*3,75,60]);
 
    };
}
module my_inner_cone( r=15.75 ){
    rotate([0,0,180])
    translate([0,0,30])
    difference() {
        cylinder(h=60,r1=r,r2=0.0, center=true, $fn=60);
        cylinder(h=60,r1=r/1.2,r2=0.0, center= true, $fn=60);
        translate([0,-(r*2),-30])
        cube([r*3,75,60]);
 
    };
}
//
//rotate([0,0,-90])
// my_inner_cone();
//
//
//union(){
//      my_cone();
//    rotate([0,90-72.95,0])
//    translate([(36.8/2)/sin(72.95),0,0])
//    cube([30,30,30]);
//}

//

difference(){

union(){
        minkowski() {
            cube([0.01, 39, 30]);
            cylinder(r=18.4, center=true);
            $fn = 60;
        };
        minkowski() {
            cube([0.01, 39, 3.5]);
            cylinder(r=20, center=true);
            $fn = 60;
        };
    }
    
        
    minkowski() {
        cube([0.01, 39.0, 30]);
        cylinder(r=15.75, center=true);
        $fn = 60;
    }
    rotate([0,0,90])
    translate([0,0,25])
    my_cone();
    rotate([0,0,-90])
    translate([-39,0,25])
    my_cone();
    rotate([0,-90+72.95,0])
    translate([25,0,0])
    cube([30,39,30]);
    rotate([0,90-72.95,0])
    translate([-24.9-30,0,0])
    cube([30,39,30]);
    
    rotate([0,0,-90])
    translate([0,0,-1])
    my_inner_cone(r=16.5);
    rotate([0,0,90])
    translate([39,0,0-1])
    
    my_inner_cone(r=16.5);
    
    rotate([0,-90+72.95,0])
    translate([-14.5,0,-20])
    cube([30,39,20]);
    rotate([0,90-72.95,0])
    translate([-15.5,0,-20])
    cube([30,39,20]);
}