While I was waiting for a migraine to dissipate I got an idea about how to fix some of my early prints where the layers threaded instead of melting together.
So after my head cleared, I took one of my early prints and put it into the microwave on a glass plate.
I started slowing heating the print a few minutes at a time.
After about ten minutes, the printed part became pliable.
A few more minutes I took the part out and let it cool.
To my delight, the threaded layers actually melted a little together, making the print more solid.
I do not know if this technique will work for other filament types. I am using PLA, but it looks like a little microwave heating can have some beneficial effects for some print issues.