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radius = 8.25; wall = 6; len = 60; rotate([0,90,0]) difference() { cylinder(r=radius + wall, h=len, center=true); translate([0,0,len/2+wall/2]) cylinder(r=radius, h=len, center=true); translate([0,0,-len/2-wall/2]) cylinder(r=radius, h=len, center=true); }