I can't add printers after High Sierra Upgrade

Hi everybody!

I just upgraded my imac to high sierra, and after the upgrade i'm unable to add any printers. I go into the printer screen in preferences, I press the plus sign, and I see both my printers (one Epson, and one Samsung printer, which are both on my local network). However, when I try to add them, It looks like they install correctly (no error message) but they don't show up in the list of printers after being added.

I've tried:

• Deleting everything in library/printers
• Installing new drivers
• Updating firmware of both printers
• Resetting the printing system
• Ensuring i'm on the same wireless network
• Adding both using Airprint, Airprint secure and the manufacturer's drivers
• Adding using IP address as well
• Installing all Apple updates (incl the latest version of high sierra)

All the above to absolutely no avail - I can't get the printers to show up, even if I can easily find them on the network.

Any ideas please?