Tape at the end of spool

[Numfuddle]

I’ve had this issue on a brand new spool of PETG-HF I purchased last week.

It uses the new application method and the AMS tore off the tape and a piece of cardboard with the filament.

Fortunately for me the tape and cardboard got stuck on top of the funnel and didn’t get dragged through the whole AMS.

This ruined an 18 hour print and over half of a spool of PETG at 98% completion of the print.

So about 12 Euro worth of filament (plus energy cost and wear/depreciation) due to less than a cent’s worth of black adhesive tape

[Numfuddle]

The filament wasn’t put through a dry cycle, I directly used it after I took it out of the plastic packaging

[Numfuddle]

It doesn’t seem to have been solved. I can give you the serial number of a PETG-HF spool I purchased less than a week ago with this issue

[Spoon]

@MZip

To be fair, I did not let the AMS even try to pull the filament free. It might have plenty of pull to do that. I didn’t give it a chance to prove itself and it’s the only roll I’ve hit so far with this tape anchor method.

If you had to use a pair of pliers and pull “pretty hard” then it would be interesting to see if the AMS can pull it out.

@MZip

But the adhesive residue on the filament tail was real. Whether or not that is actually an issue for the filament path and extruder is another thing. The path and extruder might not care.

I wouldn’t want this going through my AMS and the possibility of depositing some of the glue in the AMS system or tubes.

[MZip]

Totally agree but since I didn’t let it even try it wasn’t really right to condemn it on that point. But it took a fairly strong pull to get it to let go - I certainly can say that.

And same. I’ll be watching for end of spool on everything to make sure I clip the filament before it starts pulling on the tape.

Personally I just don’t trust it and @Numfuddle’s experience shows at least in some instances, it’s a good call. I think tape is not the answer but maybe some more tweaking, different adhesive, etc?

[Numfuddle]

Here you can see the tape with the small piece of cardboard still attached:

You can tell that it looks like the tape after the change because it looks exactly like the “after” picture from the Bambu Lab post for the modified jig including the relatively short section where the filament was attached.

In this picture you can clearly see where the tape and the piece of cardboard detached from the cardboard roll when the AMS reached the end of the spool and tore the filament and tape off.

Proof that the tape had been attached to the cardboard spool exactly like in the modified version documented in the Bambu Lab post:

edit: this is a potential fire hazard if the printer somehow manages to drag the cardboard all the way to the hot end and even if not it could potentially seriously damage or destroy parts of the AMS or printer

[bill.m.davis]

@Numfuddle

this is a potential fire hazard if the printer somehow manages to drag the cardboard all the way to the hot end

If your nozzle temp is 233 or higher, it would cause paper to burn… (I had to calculate that from Fahrenheit to Celsius - Fahrenheit 451)

That would be very bad…

But it would have to get that tape through those tiny tubes, where it normally gets caught. So it does seem less likely…

[Spoon]

@bill.m.davis

But it would have to get that tape through those tiny tubes, where it normally gets caught. So it does seem less likely…

I agree that it’s highly unlikely to get to the nozzle but I think its not doing the First Stage Feeder or tubes any good.
I also doubt that Bambu will acknowledge this as they don’t want to be sending out replacement First Stage Feeders due to their tape damaging them or new tubes as tape glue is now stuck inside them…

[Spoon]

@SupportAssistant

Please note that the tape issue has happened for a small number of spools in a batch. The issue has been solved as described in the previous post, with the tape being correctly applied.

I think that you have been given the incorrect info on this.

It’s still happening and even new people to your printers are experiencing problems but think it’s something else…

AMS not swapping to same color when empty

Hello, I purchased the Bambu P1S with the AMS 1 month ago. I’m loving it. However, I cannot figure out how to get it so swap to the same color if the color runs out. I added 2 identical black Bambu PLA filaments into the AMS. I do have the “AMS filament backup” checked in the options. The Filament section shows both the black “Bambu PLA Basic” in the list in different slots (when I asked it to sync). They appear identical here. So as far as I can tell, I have it all setup perfectly. How…

[johnfcooley]

You guys are all bad luck. Just had a black ABS-GF run out with tape. Thankfully the tape let go, I wasn’t there watching. That spool came about a month ago.

[cabanamd]

put two holes in the cardboard on either side of the start of the filament spooling. Run a piece of cable/string/a zip tie/whatever in between the two holes. This will hold down the filament with enough force to allow spooling AND allow the filament to slip through. Not sure how they haven’t figured this issue out yet.

Or use a sacrificial break by slightly nicking the filament ahead of the attachment location, which would allow the PLA to break, rather than rip the tape off.

Really, I have a bunch of ideas on how to make this better. Tape seems like an unpaid intern’s idea.

Also, I like my idea of allowing the user to input a manual stop method based on remaining capacity/calculated use by weight.

I haven’t had this issue occur though, although I did have multiple issues of the hook method getting stuck and the PTFE tube entry with sunlu spools.

[MZip]

@cabanamd

Really, I have a bunch of ideas on how to make this better.

Then get busy testing them and report which worked and which didn’t. Sitting on the fence lobbing in digs and complaints doesn’t help. Put your money where your mouth is and show us.

[cabanamd]

the break method works. It’s how most mechanical systems integrate a weak linkage so that more important equipment doesn’t break. Think of a sacrificial link on a chain.

[MZip]

News flash - I’m sure some Bambu employee thought something similar about using tape or it wouldn’t have been pushed out as a solution.

There are details you leave out. Sure you can add a “weak linkage”. Great idea. How weak? How weak does it need to be? How susceptible will spools be to having that weak link break during spooling, shipping, drying, and use where breaking can mean no pull back if a spool is near empty but not empty?

Again, evidence, proof, results. How do you actually, practically, do it? Anyone can lob in ideas. Yours may even have merit. But until someone shows it works as intended without other problems it’s pie in the sky.

[cabanamd]

News Flash, not every idea that gets pushed out works. This is why recalls exist, as well as firmware updates. Tape just isn’t great for fastening. Even if you secured the filament to the roll with a more permanent method, and the linkage break didn’t work then the AMS would just recognize the overload condition and stop. Still better than jamming it with tape.

A 50% reduction in cross sectional area of the filament would probably be enough to allow it to break. It could even be done with an adjustable extruder. These exist which can automatically vary the cross sectional area of the material being extruded.

Also, your proposition is impracticle. I am not a paid bambu employee, so I’m not going to take the time to rig up a charpy v notch assembly and tensile strength tests to figure this out.

Bambu asserts that the issue is resolved, contrary to the evidence that it is not. They are the ones losing business, and honestly you cannot think that tape is the best solution here.

There are plenty of already in place examples of sacrificial linkages showing this works.

[MZip]

I agree that the tape method doesn’t seem to be a good solution.

I’m just saying anyone can lob stuff in at them but it’s not useful without something to back it up. That something is data.

You made it to my ignore list.

[cabanamd]

you said that in the other forum bro.

[Skarlix]

I’ve created a support ticket, but I see I’m not the only one with a problem. I don’t have AMS.

My black Matte spools all (out of 3 so far) have the tape coming off at the end of the spool and getting embedded in the printer’s PTFE.

First time, I didn’t understand, I couldn’t change filament, the tape was at the head.

Second time, the tape was so advanced that it fooled the end-of-filament sensor. As a result, he continued without a coil.

Third time, it got stuck in the PTFE. I changed it while waiting to find a way to remove the tape.

And my Matte Black PLA spools don’t have a batch number on the cardboard, unlike the others. Not easy to keep track of ^^

[Spoon]

@MZip

I’m just saying anyone can lob stuff in at them but it’s not useful without something to back it up. That something is data.

I mainly use Overture filament. Also used Eryone & RS. These just have the filament pushed through a hole in the center on the spool, without having a kink in it.
Never had a problem with any of them…
I’m sure other manufacturers use a similar method.
There is your data and proof it works…
Not sure why Bambu can’t copy this method.

[acabtp]

Inland also does it this way. No kink at the end and it works perfectly with runout detection for the AMS to swap to a new spool. It’s crazy that Bambu is still fooling around with this tape idea.