Printing output not scaled correctly on HP 7110

Hello,

We have a few Mac users that when they print a document at 100% scale to an HP7110 printer, the output is consistently about 3-4% too big.  When they print from In Design or Photoshop, the output is correct.  It's only printing from Acrobat (or Reader) that is affected. The same users can print to other printers (from within Acrobat or Reader) and the output scale is correct.  The latest printer drivers are installed for the HP 7110.  Our users are on Acrobat versions 9 or 10 with all updates applied.  Any other ideas I might try?

Thanks!

Andy