A template to check supplies on OKIDATA printers (you'll need the OKIDATA MIB).
It provides items and triggers for toner, drum, fuser and belt levels as well as a simple paper count.
I've been using it with an OKI C5950 and an OKI C610 printer.
You'll need to add a 'zabbix' snmp read community on your printer (from the Admin webpage choose Network->SNMP->Settings->Step2) or change the community to 'public' within the template.
Triggers will be activated at 10% for toner and 5% for drums, belt and fuser unit, which should be ample time to restack on supplies unless you're really printing loads of pages.