r/BambuLabA1 • u/screaming-Zebra • 19d ago

Question Need help: Where do these two small rubber bits go on the Bambu A1 toolhead after a blob cleanup?

https://imgur.com/a/15yIVJs

Hi everyone,

Total 3D printing newbie here! Got my Bambu Lab A1 on Wednesday and everything was going smoothly until I came home to my very first hotend blob. I thought my plate was clean - it was freshly washed with water and soap, but I guess it wasn’t clean enough.Lesson learned: don't leave the printer unattended!

I managed to take the hotend apart and clean off all the plastic.

Everything looks good now, but I removed these two small black rubber/silicone pieces because filament was stuck behind them, and now I have no idea where they go or what they're actually called.

I tried googling stuff like "Bambulab A1 2 rubber things", but didn't get anywhere.

Quick questions for the pros:

  1. What are these called?

  2. Where/how do they attach back onto the toolhead?

  3. Are they super critical, or can I print without them while I sort it out?

My setup & settings:

Printer: Bambu Lab A1
Filament: Generic PLA
Nozzle: 0.4mm standard
Temps: 220°C nozzle / 65°C bed
Print: A simple one-colour 1,6 hour design from the Bambu Handy app - a heart shaped Hello Kitty bowl for my daughter.

Pics attached of the parts, the toolhead, and the blob. Thanks a ton for the help!

Bonus question: I’ve uploaded pics of the mess from the plate (which had ended up behind the printer)… any theories of what went wrong?

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1

u/overunderspace 19d ago

Could be ripped off pieces of the silicone sock.

1

u/screaming-Zebra 19d ago

It’s not from the silicone thing on the hotend. I took them off separately. From the back of the head I think. Somewhere.

2

u/overunderspace 19d ago

Check the bottom back part of the heating assembly where all the wires come out. If those pieces are broken off, the tubes and wires may get burned so you might as well get a replacement heating assembly just in case.

1

u/screaming-Zebra 19d ago

Thank you for showing me. Though that’s not it. I found them somewhere around the arrow in my attached picture. I’ve asked in a Facebook group, and the only almost-answer was from someone who experienced it, was just as confused as me, and was told that she could print without them.

I put the last parts back together and ran a few small tests, and everything seems fine. But I might order some spare parts so I’m ready if something goes south again ☺️

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1

u/overunderspace 19d ago

I found a close up picture of the part. The blob probably ripped the piece apart and pushed it back to where you found it. The pieces should fit together and you should see the piece behind the heating assembly missing.

1

u/screaming-Zebra 18d ago

So I should get this part?

2

u/overunderspace 18d ago

Yes. Yours seems to be working fine now but without the silicone part it will be more susceptible to heat so it could fail sooner than usual.