I say having spent the last weekish frustrated that my printer seemed to just be awful at making prints with even loose tolerances all the sudden.
I was using filament that had been left out a month or two, so not long at all, so I thought. Killed the rest of the spool trying to tune things, prints worked perfectly when I got a new spool out.
Goddamnit.
Get a plastic storage container that seals and some desiccant.
I literally would not be able to print TPU without it, and it really helps stringing and lines on my PLA prints too.