Hello, danfromacton.
Welcome to Apple Support Communities.
I understand that you're unable to print from your Mac Mini since updating to macOS Catalina. You've done an excellent step in checking your other devices to make sure the printer isn't the issue and I have some information that may help. Start with this article here: If you can't print from your Mac or iOS device
You can also test to see if you have any issues in a test user account and safe mode:
Use safe mode to isolate issues with your Mac
How to test an issue in another user account on your Mac
You may also want to reach out to Epson and confirm compatibility with macOS Catalina:
macOS 10.15 Catalina Support
Cheers!