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This was an ornament I printed roughly 6 years ago. Being a Christmas ornament it spent most of those 6 years stored in my roof space.
Being in Australia this would have been subject to average temperatures of 30 to 35 degrees c but also peaks across summer approaching 70 degrees c. Also in high humidity.
The PLA crumbles into tiny pieces at the softest touch.
I thought it was interesting that PLA would start to break down in these conditions.
Maybe fumes from solvents in the room?
No solvents, thank goodness. It's a lab, but it's an electronics lab. And no, anything with soldering or cleaning boards is done far elsewhere.