Device: Parallel Port
Make: HP
Model: LaserJet 2P, Foomatic + ljet2p
/etc/cups/ppd/printername.ppd
...
*OpenUI *Margins/Page Margins/Offsets: PickOne
*DefaultMargins: Custom
*Margins Default/Driver Default: ""
*% ... HWMargins[left bottom right top]
*Margins Custom/Custom (set with 'alignmargins'): "<</.HWMargins[9 12 20 12] /Margins[0 0]>>setpagedevice"
*CloseUI: *Margins