Do you really need to dry your filament?

Can you leave your PLA spools out in the open and do you really need to dry PETG before every use?
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Products shown:
Prusa MK3 http://go.toms3d.org/MK3Ass
Prusament http://go.toms3d.org/Prusament
Eibos filament dryer:
on Amazon http://go.toms3d.org/EiDry
on Aliexpress http://go.toms3d.org/EiDryAli

Read the article to this video here: https://toms3d.org/2021/11/23/how-bad...

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