Updating network printer driver
As something to try maybe add the printers using CUPS (see lpadmin man page) instead of Casper capturing? I may try and snapshot the Apple install disk (as opposed to trying to snapshot the update process, which is what I was doing previously) as just dropping the HP PKG into Casper Admin generates a package that mounts, then unmounts, but doesn't actually install anything.
This works pretty darn good however I have one continued issue that I don't think has to do with my workflow.
Ultimately, we just download Apple's HP and Canon PKG's (I believe they also provide an Epson package) directly off their support page and drop it into Casper Admin (similar to you snapshot packaging resulted in problematic results).
We set them to install during the imaging process, but also include a Repair Disk Permissions script (diskutil repair Permissions /) to run "At Reboot". For some reason if you Repair Disk Permissions in the UI after manually installing Apple's package you also need to "Reset Printing System" and reboot.
Complains that printer is installed incorrectly, requires download to fix it, but then works. 3) Checked for drivers from HP - nope, they are handled by Apple update.
Rather than continue to spin my wheels, I thought I'd check in and see what folks are doing for print drivers that are handled via Apple updates.