I do something similar (with regular printers) using @fblackburn's Node-RED Hubitat integration.
I have two laser printers - both of which are on z-wave outlets. I use scripts run out of systemd that monitor the spool for each printer. When the number of documents in the spool is >0, using MQTT, a message is sent to turn on the appropriate printer (if it is off). Five minutes after the spool has zero documents, the printer is turned off (if it is on).
Works exactly as intended, and I imagine this could be adapted to work with any printer that has a spool that can be monitored and is plugged into a z-wave outlet.
