I updated to Catalina last year. I have several issues in my networking ecosystem at home including printing to my Dell 1320c printer
Basically I used my printer as a network printer, attached to the network via Ethernet cable. So I tried workarounds to circumvent the need for a missing Dell 64-Bit Driver.
I also read this thread and reinstalled my printer with the Xerox driver. The "Filter failed" issue is gone now but another issue popped up.
The Print job is starting but showing the message "printing - connecting to printer" and after a bit of time "the printer is unreachable at this time" or "printer may not exist or is unavailable at this time".
I was also looking for compatible 64-Bit open source drivers but did not find any.
Does anybody have another idea what else could fix this issue?