How do you reset the printing system in OS X Mountain Lion?

Open the Print & Scan pane of System Preferences, and delete all of the printers in the Printers list.

Navigate to /Library/Printers/ in the Finder, select all items, and move them to the Trash.

Open Printer Setup Utility and choose Reset Printing System from the Printer Setup Utility menu.

Open the Print & Scan preferences, Control-click in the Printers list, and choose Reset printing system from the shortcut menu.