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radius = 8.25;
wall = 6;
len = 30;
difference() {
union() {
hull() {
rotate([0,0,30]) translate([wall,0,0]) rotate([0,90,0]) cylinder(r=radius+wall,h=len+wall*2);
rotate([0,0,-30]) translate([wall,0,0]) rotate([0,90,0]) cylinder(r=radius+wall,h=len+wall*2);
translate([0,0,-radius/2-wall]) cylinder(r=radius+wall,h=radius+wall*2);
}
cylinder(r=radius+wall,h=len);
}
rotate([0,0,30]) translate([wall*2.4,0,0]) rotate([0,90,0]) cylinder(r=radius,h=len+wall*2);
rotate([0,0,-30]) translate([wall*2.4,0,0]) rotate([0,90,0]) cylinder(r=radius,h=len+wall*2);
translate([0,0,-radius/2]) cylinder(r=radius,h=len+wall*2);
}
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