Why PETG tolerates neglect better than PLA: chemistry and a three-year-old spool test
A Hackaday article compares PETG and PLA filament for FDM, covering polymer chemistry, degradation and recycling. The author also printed a cable chain from an undried PETG spool bought in March 2023 and stored carelessly. The print came out cleanly, with no brittleness and no stringing, which fits the literature on PETG stability.