Prusa Filament Quality or CoreOne
Have been using my CoreOne for past few weeks without any issues (came from a MK3S+), recently tried some Prusa PETG Signal White filament and it's constantly becoming "tangled" (not knotted) so the spool is getting stuck and ruining my prints. Prusa support has suggested (unhelpfully) to unwind several meters of filament and wind it back onto the spool neatly. After two ruined prints, I am close to giving up on this spool and switching my brand of filament, is there anything else I can do with the printer, spool to try avoid another failed print - I really don't want to babysit (watch over) every print I do on this new spool!
RE: Prusa Filament Quality or CoreOne
Sadly, I don't think you can fix this, apart from unwinding the full roll.
If you unwound a few meters and it's happening again further down the roll, I'd ask the support for a new roll.
Maybe you could build this re-spooler to fix your roll:
https://www.printables.com/model/1106755-easyspooler-filament-respooling-tool
RE:
Is the filament tangled or wedged?
Tangled is where it crosses under itself. It can happen if the end gets lost and pulled back under another loop. Pulling a feet meters off by hand and rewinding it, as Prusa suggested, usually solves the problem.
Wedged is where it gets pulled into a gap at the edge. It’s caused by poor winding at the factory. This is trickier, as it feeds fine until the unwinding gets close to one edge of the spool. Then it wedges tighter and tighter and the spool gets pulled out of place. Much depends on how the spool is supported. Best results I’ve had with problem spools like this is to route the filament so it is feeding straight up from the spool and to hang the spool on a spindle vs sitting on rollers. The core one by design feeds that way by default. Is that the way you’re feeding?
There’s a longer discussion here - https://forum.prusa3d.com/forum/english-forum-general-discussion-announcements-and-releases/filament-tangles-what-to-do/#post-750138
MK4S/MMU3
RE:
So, I've had x2 Wedges (at the edges) like you say, and also a tangle where the filament has crossed under itself - I caught the first one as I spotted the spool starting to lift off the arm / spool holder.
I have the spool installed on the standard arm/holder with the filament leading upwards towards the tube - which all my other filaments have been fine with. Just seems to be this one spool so far but I've ordered quite a few recently to maximise advantage of the shipping costs so really concerned about the others and leaving the printer unattended.
The tangle is almost like the spool needs more friction to prevent more filament unwinding on the spool create 'loose loops' which then trap the filament - like a clutch type mechanism?
Is the filament tangled or wedged?
Tangled is where it crosses under itself. It can happen if the end gets lost and pulled back under another loop. Pulling a feet meters off by hand and rewinding it, as Prusa suggested, usually solves the problem.
Wedged is where it gets pulled into a gap at the edge. It’s caused by poor winding at the factory. This is trickier, as it feeds fine until the unwinding gets close to one edge of the spool. Then it wedges tighter and tighter and the spool gets pulled out of place. Much depends on how the spool is supported. Best results I’ve had with problem spools like this is to route the filament so it is feeding straight up from the spool and to hang the spool on a spindle vs sitting on rollers. The core one by design feeds that way by default. Is that the way you’re feeding?
There’s a longer discussion here - https://forum.prusa3d.com/forum/english-forum-general-discussion-announcements-and-releases/filament-tangles-what-to-do/#post-750138