I'm a relative newcomer to 3D printing, so I don't know what constitutes an unacceptably bad spool of filament.
About 1/6 of the way into a roll of PETG (and maybe 4 hours into a 6-hour print), an over/under wrap brought things to a screeching halt. I aborted the print, then snipped the filament and started unspooling it, looking for more cross-wraps. I found a ton of them, along with a ton of kinks.
I stopped about 1/3 of the way into the spool, still finding kinks and cross-wraps, and said to heck with it. The only way to use it would have been to run the entire length onto another spool, carefully avoiding cross-wraps, and hope the kinks wouldn't affect the print quality.
I complained to the supplier but never even got a reply, so now I'm wondering if this is just one of those things I can expect from time to time. Any thoughts & opinions would be much appreciated.