Printer Setup, Software & Drivers

My Color LaserJet CP1518ni has stopped working on two MacOS systems. One system is running MacOS 10.15.7, and the other is running 10.14.6.

Behavior: When I attempt to print, it looks like the document is spooling, but the printer remains idle. The application is irrelevant, but I've tried Pages, Preview, and printing a test page from the Print Queue window.

After I started having problems, I downloaded and installed "HPPrinterDrivers5.1.dmg". One the 10.14.6 machine, that installed without complaint. On the 10.15.7 machine, it gave me an error about an outdated certificate.

Before you ask: Yes I did power-cycle the printer (including unplugging), I did Reset the printing system on both computers, and I I did reboot both computers. The printer is connected by Ethernet. One computer is on WiFi, the other on wired Ethernet.

If I open the Error Log from the Print Queue window, I see numerous errors from [cups-deviced] which say "PID nnn (hpfax) crashed on signal 9!"

At one point on the 10.15.7 machine, I was getting an error that some of the HP printer software would "break my computer" and that a report was being sent to Apple. That stopped happing after I installed the new drivers anyway, even after the certificate error.

I don't print often, but when I do it's important stuff for me. I last printed in mid-September, and it worked fine.

This seems like a software problem between HP an Apple. It looks like I should cancel my latest HP Toner order, because this perfectly functioning and otherwise reliable printer might be a victim or planned obsolescence.