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945 B

$fn=180;
difference() {
union() {
cylinder(d=25, h=25, center=true);
translate([0,0,5])
for(angle = [0, 180])
rotate([0, 0, angle])
translate([0,15,0])
rotate([90,0,0])
cylinder(d=15, h=15, center=true);
translate([0,0,-5])
for(angle = [90, 270])
rotate([0, 0, angle])
translate([0,15,0])
rotate([90,0,0])
cylinder(d=15, h=15, center=true);
}
union() {
cylinder(d=16, h=25.01, center=true);
translate([0,0,5])
rotate([90,0,0])
cylinder(d=6.25, h=50.01, center=true);
translate([0,0,-5])
rotate([0, 0, 90])
rotate([90,0,0])
cylinder(d=6.25, h=50.01, center=true);
}
}