I used the spool of filament for printing for about 3 weeks so I didn't even think of special storage or anything like that. Now about halfway through the spools I've used, the material seems to be getting very brittle and keeps breaking in the middle of prints. it even sat long enough when i left it for a while to burn out the nozzle and i had to replace it. I am new to 3D printing and am using Ender 3 Pro. It took me a while to figure out it was a thread issue. I even did a few printer upgrades to fix the problem before realizing it was the filament. I actually have two more spools of this thread that I have yet to seal before starting a new brand.
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