So this is what I’m talking about. I tried pulling that piece out and it snapped at the feed wheel. Filament gets brittle when it’s left out in the open air, it gather moisture and looses its strength. That’s fine when it’s on the roll or being used, but when you leave it in the machine over night it is under stress inside the printer head.
Don’t assume that this will be done at the end of the night, or that someone else will be using the printer after you. The small amount of lost plastic when changing filament is nothing compared to the potential damage to the feed system going in there with needle nose pliers can cause. Please remove the filament when you are done using the machine.
Second issue I noticed was all 3of these spools of filament were left loose, there was no attempt at keeping them untangled. When you’ve removed a filament from the machine you should find the small double holes on the spool and feed it through as shown, this will hold on the to filament until someone else needs it. Some brands of filament don’t have these holes, a piece of tape works well in that case.
I’ve seen some 3d printed clips to help with this issue in the past, but I find these holes to do the trick most of the time.
Without this a roll of filament WILL get tangled which can harm your print or the machine, especially on longer prints.