I noticed that the PPD that ships with foo2zjs has HWMargins as:
*HWMargins: 12.00 12.00 12 12
With these settings, the page is slightly misaligned, which is problematic when printing things that require precise alignment such as labels.
The HP-vended PPD (as part of HPIJS) uses these margins:
*HWMargins: 18.00 14.40 18.00 14.40
I've found that those margins work well for me
Forum: HP Color LaserJet CP1215