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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.
60C is when PLA starts to warp, but even lower is when it starts to degrade. 6 years is more than enough for this level of degradation even in a less volatile environment.
It’s interesting to me the reported natural feature of PLA to be biodegradable. The state it ends up in these conditions almost seems worse for the environment like micro plastics.
Starch-based polymer != starch