this post was submitted on 29 Apr 2025
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Degradation over time?
The stress is from cooling the filament and then winding it around the spool. Lots of reasons why the plastic would weaken that stress might suddenly give way, but most of them involve time. If it wasn't completely cooled internally before being spooled, that would dramatically increase the stress (think Prince Rupert's drop).
Op says the roll is pre-Covid, so the time piece checks out.