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?
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.
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
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…
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.
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.
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.
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.
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.
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.
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.
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.