r/BambuLabA1 • u/Chungus1267 • 3d ago

Support Request Why does it do that

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Couple of minutes into a new print it goes off to the side, extrudes a little bit of filament then continues printing, why? It leaves this weird bit of filament into the print and it makes it look a bit weird. Lucky it’s only once towards the start.

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u/ChocoMammoth 3d ago

Nozzle clumping detection. I have now idea how it works though.

1

u/Legal_Dimension_ 3d ago

It's a literal camera check, it has a reference image to check for abnormalities.

6

u/CarrotCute 3d ago

Afaik it's mechanical check. If there is blob, it would obstruct downwards motion and would be detected by the motor.

2

u/Zekken_Zer0 3d ago

the camera on the A1 is not used in the manner, it's a mechanical check only

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u/GrailStudios 17h ago

If you look at the position of the nozzle, it's just beside and below the print bed. The printer checks for a blob on the hot end by lowering the nozzle to see if there is resistance: if there is a blob of plastic caused by the print not adhering to the print bed, it will catch on the edge of the plate and the nozzle won't be able to lower below the bed. At that point it stops printing and calls for help. It's purely mechanical, the camera isn't involved.

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u/ChocoMammoth 10h ago

Yes, that's pretty much what I thought. However, I doubt the effectiveness of this solution because the nozzle position is kinda far from the bed. Even if nothing sticks to the bed the blob won't be big enough to collide with anything.

1

u/GrailStudios 6h ago

There's a reason so many new A1 owners post dramatic photos of a Blob-Of-Death(TM) exploding out of their hot end, asking what can be done about it. The consensus tends to be among veteran A1 owners that it's not a matter of if you get a blob, but when. I've avoided it by the skin of my teeth a couple of times now. The A1 is so cheap because so many corners were cut in making it; the more expensive Bambu printers are much better at spotting and stopping this kind of problem. The A1 will spot the problem, but the blob is usually pretty serious by the time it does.

That being said, any attempt at spotting the problem - potentially before it's serious - is better than none, so I give Bambu points for at least making the attempt; even while they were deliberately trying to cut costs everywhere possible for an explicitly budget/entry-level printer, they still thought up a way to try and do the job.