Bambu Lab A1 Mini: Screw Fell Out During First Print – Where Does It Belong?

Hi,
I recently bought a new Bambu Lab A1 mini. After completing the calibration, while printing my first Benchy, a screw fell from the upper part of the printer. I’m not sure whether it came from the toolhead, nozzle, or purge wiper. The missing screw did not interrupt or affect the print this time.

Below is a picture of the screw. Do you have any idea where it may have come from and how to reinstall it?

I checked this page, but I couldn’t find the screw listed there:
https://wiki.bambulab.com/en/knowledge-sharing/common-screws

I’m concerned that the missing screw could cause issues in future prints.

Thank you for your help.

can you show a picture of the printer

Thanks for your message. I’ve included a few pictures, let me know if you need any additional or more specific ones.

There are 2 corresponding screws on the underside of the z axis slide, like the ones I have marked in the picture.

Is one of these missing?

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Thanks! I tried placing the screw in that part, but it doesn’t fit—the screw is too small. I then checked the documentation more closely and found the image below (picture on the left), where the hole actually appears to have no screw.

Also, the screw I found has a Phillips head, while most (if not all) of the other screws on the printer seem to be hex head. Because of that, I was wondering if it’s possible the screw may have fallen in accidentally during assembly or packaging, do you think it is common?

I’ve already done a few prints, and everything seems to be working and printing well so far.

Thanks again for your time and help!

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look underneath extruder at vent housing

Maybe its the fan directly beside the nozzle

Thanks I had a look and I can see all screw there.

Hi, I checked the fan as you suggested (thanks for that). I can see all the screws in my printer, except for one hole that is not covered. However, according to the documentation, that hole is not supposed to be covered either (at least from my understanding). The toolhead was closed while printing, so I’m not even sure if the screw could have come from there.

From docs:

I looked at the replacement guide looks like there is soppose to be

Are you referring to this image….the screw close to the fan? Could you please send me the direct link to the image you’re referring to? Thanks again for your time and help!

Yes that image, in your image you have the screw swapped,

No, this is not the problem but will help for future problems

Yes, you’re right, now I understand your point. Since I’m quite new to 3D printing, may I ask how changing the position of that screw would help? This is the current setup as it came from the factory, which is a bit strange because it seems different from the documentation.
Once again, thank you for your time and help.

Have you done any other prints, if not try and see if it works,

If so is there any sounds or problems

Yes, I’ve done several prints so far, and I haven’t noticed any strange sounds or other immediate problems.

it may be an extra screw that doesn’t go anywhere, if I were you I would forget about it until it causes problems

yes it makes sense, thanks again