I found this suggestion on the following website. It sounded like a good idea except that when I leave the printer on, it eventually goes to sleep and requires a manual turn on. II've sent the a note to Marrutt USA to see if they have another solution. Thanks for your reply.
https://www.marruttusa.com/printer/support/canon-ipf-6400-help.php
TIP: If you go on vacation, why not leave your printer switched 'on' and connect your printer to the mains through an inexpensive timer switch, set to turn on for a few minutes every other day - when you return, your print head will be in perfect order, ready to print.