Sadly, my wifi is still broken though. I’m not sure what caused that, but it was something taken with an update. 
EDIT: I spoke too soon!
I realized I had removed the dtparam=ant2 line from config.txt before I started testing battery consumption. I added that back in, rebooted, and now wifi shows up and works fine! So that wifi antenna fix seems to be necessary.
I now have a working printer again and working wifi. And the cause of both problems seems to be unrelated, and easily fixed. 
EDIT #2 (since the forum won’t let me post again):
Here’s another relevant post about the printer driver. I guess it was already known, but buried in the forum as a lot of useful I formation is. Anyhow, it confirms what I found above.