Just thought I’d chime in here with my experience, which is not much but, here goes.
I was nearing the end of a spool of nGen material.
Looking at the spool, as the print was running, I thought, I wonder what happens if the filament sticks because of the
way it’s wrapped on the spool?
I found the answer pretty quickly!
When the nGen filament somewhat stuck because of the way it happened to unwind from the spool, The hobbed gear
spun on the filament and the print failed.
When nearing the end of a spool, either unwind the spool and place the loose stuff on the spool holder, or
really watch and assist the spool to rotate so the filament does not, in any manner get hung up.
That’s just my 2 cents worth.