I hadn’t used the u1 for a week or so and wanted to change the filament, when I noticed it was broken right before the feeder, on both sides on the lower spools. It wasn’t broken all the way, but when I touched it, it snapped in two. Anyone here had the same experience, or is it just me.
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drying brittle may return it flexibility
I had that with some (very old) Noyes PLA. It’s not fun removing the pieces from the tubes. 
According to Zach Freedman, it has to do with internal stress when the filament is being hold in a position different from how it was initially spooled on in the factory: https://www.youtube.com/watch?v=S6_xnzt9YPU&t=999s
So for that filament, basically you’d have to unload it every time after use. 
I’ve since switched to a different filament manufacturer and with newer filament didn’t have that problem again so far.
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Happened to me with Cookiecad PLA… The sparkly stuff, was a huge pain trying to get all the pieces out of the extruder and tubing. I literally did a few prints and then would have feeding issues because another piece would be found inside. Never buying Cookiecad again…
I use Sunlu pla+ 2.0 most of the time and it’s just annoying, but it turned spool so it pulls from the top, so i just have to see if it breaks again.
I need to heed my own words but if you know you won’t be printing within a few days it’s best to remove the filament. As stated, it became very brittle and snapped. If you have the ability to dry it properly you should be able to use it again as normal 
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Leaving certain filaments open to air, especially humid air, for long periods of time can lead to moisture absorption which can make it very brittle.
PLA, for example.
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