You never know. Old filament CAN be used, but it takes special care with the slicer settings and it helps a lot if you have a dehumidifier to dry it out. I live in a dry climate, and have filament at work which has been sitting on the shelf for about 7 years, but I can still get beautiful prints out of it. All of my filament at home is left in ziplock bags but it still gets brittle over time (if you can easily snap the filament, it probably has a lot of moisture in it).
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