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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.
My boss printed me three LEGO bricks when he got his 3D printer (everyone here knows I am an AFOL = Adult Fan Of Lego). I have no idea what kind of printer that was, but the bricks were very detailed. Now they have totally warped out of shape. I kept them on my desk in the electronics lab, so heat or sunlight are no major issues here.
Resin printer probably
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.