There’s a specific kind of confidence that comes from opening a fresh roll of PETG. The bag is tight, the desiccant packet is still inside, and the filament looks untouched. It’s easy to treat that as proof that the spool is ready to go straight into the printer. I’ve done that plenty of times, and I’ve also wondered why a brand-new roll suddenly started stringing before I even had a chance to blame my slicer settings.