How to use nagios to monitor a printer

I have network based printers, and I was wondering, as all network printers with SNMP able to give up information such as if they need ink, or toners or just their general status.

I'm not the greatest fan of walking up and down flights of stairs checking printers, because users can't be bothered to mention that a printer isn't working. (Unless they have a deadline, in which case, they use the broken printer, and somehow remember exactly how to log incident tickets!)

Any hints and tips appreciated. Thanks