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radius = 8.25;
inner_radius = 13.5;
wall = 6;
top_wall = 6;
len = 40;
cut = 10;
module external(radius, wall, len, top_wall) {
w = len/2+radius+(radius+wall)*sin(60) ;
h = (radius + wall) / 2;
difference() {
translate([-len/2-radius,0,0]) rotate([0,30,0]) cylinder(r = radius + wall, h = len + top_wall);
translate ([-w,-w,-h]) cube([w*2, w*2, h*2]);
}
}
module tube(radius, wall, len) {
translate([-len/2-radius,0,0]) rotate([0,30,0]) translate([0,0,-wall/2]) cylinder(r = radius, h = len);
}
difference() {
union() {
hull() {
external(radius, wall, len, top_wall);
rotate([0,0,120]) external(radius, wall, len, top_wall);
rotate([0,0,-120]) external(radius, wall, len, top_wall);
}
difference() {
translate([0,0,-(radius + wall) / 2]) hull() {
external(radius, wall*3, len, top_wall);
rotate([0,0,120]) external(radius, wall*3, len, top_wall);
rotate([0,0,-120]) external(radius, wall*3, len, top_wall);
}
translate([0,0,len/2]) rotate([0,10,0]) cylinder(r=(len+wall), h=cut);
}
}
tube(radius, wall, len);
rotate([0,0,120]) tube(radius, wall, len);
rotate([0,0,-120]) tube(radius, wall, len);
}
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