PLA Filament Owners Say It Oxidizes, Causing Weak Bonds
PLA filament buyers report oxidation-related weak bonds, brittle snaps, and layer splits after the spool sits in open air, warm storage, or direct light.
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PETG Filament Owners Say It Warps Despite an Enclosure—Warping and Bending Complaints
PETG filament owners report a recurring warping and bending complaint even with an enclosure, and moving up a price tier does not solve it by itself.