This is a remix of nfoster262's Boeing 747, which is highly detailed but has some very weak parts when printing.  I added internal material to reinforce the engines, outer engine mounts, and vertical tail control surfaces.  

I recommend print this nose down.  Manually add some support above the cockpit window and on the belly so it doesn't get pushed over when printing, and the forward wing roots also.  

Printing nose down gets better detail on the fuselage windows and doors, and also removes the need for a ton of support material under the wings.