I have recently installed LM12/Gnome on my desktop and my laptop and have enjoyed the experience. However, changing the default printer from PDF to the actual printer has taken a while. I have also got rather bored trying to convince the printer settings that I use A4 paper.
I came across a post on this forum where we were advised to enter http://127.0.0.1:631/ into the web browser. MARVELLOUS. All is now as I want it. But my suggestion is that a link is inserted into "System Settings" or "Advanced Settings" to simplify accessing CUPS.
I previously used KDE on SuSE and these folk have the HP GUI for setting up the HP printers. Maybe spoilt by the KDE experience! Having the Gnome version of this would be the absolute best result, but that must be quite tricky as it has not been done yet.
Regards and thanks for LM12.