Bambu A1 random screw fell out mid print

As the title suggests, I was mid print and as I glanced over to check the print progress, I could see it had gone haywire and the print was all messed up. Upon further inspection, I found this random screw fell out from somewhere and hit the floor, initially I thought it hit the print bed but now I can’t quite recall if it did. I have only had this printer 2 days so it’s a little unexpected. Of course I then checked all obvious locations along the printer frame and opened up the toolhead, but this screw is not like any of the others. See the picture attached. It’s a short stubby screw with a short half-thread and a thick rubber washer. Anyone know where this comes from??? Can’t see it in the Bambu spare screw kit on the bambu webpage and can’t find anything online. Or will I have to teardown the entire tool head and hope to find an empty hole? A little bit skeptical to try and print before finding the location for this damn thing. I’ve also flipped the printer upside down as there are a lot of screws beneath, but couldn’t see any obvious holes.



Thanks in advance.

I’ve taken the toolhead & the bed apart & don’t recognize it at all.
I even looked on the Wiki and didn’t see anything.

might be the under the bed screws you’re supposed to tighten on first setup as they ship loose

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Is it from the right side of the print head?

A1 Mini:
I just had a screw fall out of the tool head after doing a calibration.
Took the tool head apart & can’t find where it goes.
It might explain my Z-Offset issues I’ve been having lately, I put in a ticket.


I think it is from the plate behind the nozzle

I for got I posted in this thread, anyway…

Did you find out where it came from? I saw a random rubber thing that looks exactly the same as yours, but I have no idea where it fell from.

If you mean for the screw I posted originally, yes it did indeed turn out to be a screw from under the bed, turn the printer off and pull the bed forward, look up underneath and you’ll see some screw holes, mine came from under there, seems all are super tight except that one and it never seems to screw in that far at all so comes out often.