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Discussion on whether filament stored on spools is UV stable?

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If this has been discussed to death, feel free to direct my attention to that/those threads.

Are PLA filaments UV stablized by mfgr? I see photos of spools haphazardly stacked in windows which get direct sunlight at least part of the day, and wonder if that hastens degredation causing print issues further down the line?

Any suggestions welcome.

 

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