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1.2. Adobe Flattening during printing

 In Adobe Acrobat or Adobe Reader you can select your printer and then hit the Advanced button in the lower left of the Adobe Printer Dialog.  Then check the Print As Image option and if it also has an option for the dpi try 300 or 400 dpi.  This way Adobe will convert the PDF to an image prior to sending it to the printer and it's the solution Adobe recommends for any printing problems from Acrobat or Reader.