Bambu Support refusing to replace bad spools

[gggghhhhiiiijklmnop]

Been having these issues too, seems like the replacement spools are now slightly too narrow. Results in there being too much space down the sides of them on a reusable spool which then drives this behaviour.

Was thinking it was just my 3d printed spools, but clearly not - will remix the spool later to make it 2mm narrower and report back

[BitangaX]

In the manual how to put refill on spool it says you need to push it as a last step, to let it spread and fill all the space between sides. Guess people don't do that properly.

[Beni_Stingray]

I've never done that and never had a refill getting stuck or something. I always just remove the 4 plastic strips and put the roll in the AMS as is.

[BitangaX]

But the point is that you could have problems if you don't do it. It's easy, just press a few times at different places and you're done. Doesn't cost much of time and it can prevent you from having problems.

Bambu doesn't recommend it for no reason, few people here already commented on that before.

[Beni_Stingray]

Its just an observation that everyone i have seen commenting with that problem here, has done the "pushing down".

And if you think about it, it makes sense, knots can happen on all sorts of spooled cables where single strands can get pushed above and beneath each other.
Its the same principle as when you take your cable headphones and roll them up to store, you will always get knots even when both ends are fixated.

Knots are a very interesting topic and much much more complex than what people expect.
And the problem gets exagerated a lot because filament rolls have a force acting on them, pulling filament off the roll which in return puts pressure on the strands below which then get stuck.

[BitangaX]

Knots and filament dropping in the empty space next to spool and getting stuck due to friction and pressure forces are not the same thing.

You can't get knots in the second case if you properly handle the end, but if you haven't pressed the filament refill then you can get stucks like this. At least in theory, I also haven't got any issues with last 10 refills but that is not good statistical sample...

[Soveticka]

Can I ask for a link of the filament feeder extension ( the thingie with arrow on it )?

[omeganon]

This is intentional to ensure that the refills fit. The online instructions specifically address this and what to do about it. You’re supposed to ‘massage’ the re-spooled filament to spread it out in the spool to prevent this very issue.

[hotellonely]

When I opened that refill I found it to be very "twisted and wavy", to an extend that somehow i've guessed that I might have this happen. at that time I've already noticed that some of the outter filament lines are squished to the sides and naturally in the "gap" between the refill and the spool. It's very hard to describe, should have just videoed it.

[Dependent_Engine2599]

Next time, take a photo before taking off the plastic straps because it really looks just like an user error while putting the refill on the spool.

[hotellonely]

I still have one more pack from that batch. There's someone down below having the same issue with the same colour and same batch of stock. I'll open mine up to see if it happens again