Does HP officejet k8600 have a manual duplex option?
The HP officejet k8600 manual duplex print option is possible since the product specs does suggest otherwise, but you are really better of buying the optional unit. Because without the hardware that flips the paper, you will have to use the rear manual feed tray and be creative in timing the paper during printouts (ie. manually reversing every after print of a page), these are of course prone to printout errors (ie. reverse, overlap prints). But then again, it is possible and may even work on paper sizes that the optional duplex module can never accomplish. Below is the limitation of the automatic duplex module in terms of paper types sizes and specs (page 17): http://www.retrevo.com/pdf/23135ag322/10… hope this is helpful, thanks!