Selecting Print from the File menu in Photos instantly brings up spinning beachball forever and requires a force quit of Photos

That's very weird. Does this occur with other Photos Libraries? or other accounts?

To narrow things down, try these steps:

• Restart the computer (of course, you've clearly done this!)
• Re-start in Safe Mode. This bypasses certain potentially disruptive processes. Safe Mode is different for different computers, so see this: 

           Start up your Mac in safe mode - Apple Support 

Those are the easiest things to try first. Then try these:

• Use another library if you have one, or make a small test Library with a few pictures in it and see if the same thing happens. You can create a new Library by closing Photos and then option-clicking on the Photos icon.
• Make a new user and see if the same problem recurs with it
• Rebuild your Photos Library--close Photos and re-launch by option-command-clicking the app icon.

The idea is to find out if the problem is with the Library, with your account, or with caches and login items, and stuff like that. One of these steps may fix the problem, but their failure to work also helps figure out what's happening.

Where is your library located? If it's on an external drive what kine of drive and how is it formatted? It must be formatted either APFS for SSDs or OSX Extended (journaled) for HDDs.