SON OF Duplex Printing

Apparently you must choose printer Am-Ref1 and go to the "Finishing" tab to ask for double-sided print. WARNING: DO NOT CHOOSE PRINTER "AM-REF2: DOUBLE-SIDED." If the printer itself asks you to take the paper out and reload it into tray 1, you have done something wrong. It should pop the paper out, suck it back in, and then re-pop it all by itself.