I have a Lexmark C543dn printer which worked fine until I upgraded to Big Sur. As an old printer Lexmark has not published a new driver for Mac OS 11 so I re-installed the printer using "Generic Postscript printer" as the driver. I can now print with my MacBook Air connected directly to the printer with a cable, but I cannot print over my home network from an iMac. I can install it on the iMac apparently using Bonjour, I can see the printer's webpage with supply levels etc, but when I try to print the printer job sticks on Paused with the message "Ready to print". Any suggestions to get remote printing working would be very welcome.