Soldering iron with an old tip and tweezers works well. Don’t ask how I know.
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Looks like your extruder created a wormhole in another dimension and some worms are trying to escape 
I’ve setup this yesterday and got it working GitHub - bdwilson/obico-bambu-octoprint: Workaround to get Obico spaghetti detection to work on Bambu printers via Octoprint virtual printer
I haven’t tested it extensively but finger crossed - this might help in avoiding catastrophic failures in the future.
Additionally yesterday’s update lists the following, which I hope will help reduce such failures:
A1 version 01.02.00.01 (20240206)
- Introduced ‘Nozzle Clumping Detection’ which can automatically detect filament clumping on the nozzle.
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Hi,
I had such blob and wrote: Extruder blob - filament blob on printhead.
So clearly I remember that shocking moment when I saw it the first time.
As there was nothing on the Bambu Forum I searched around the internet a lot.
Conclusion out of that: if you can’t heat up your hotted anymore - like by sensor failure. You have to CAREFULLY heat up the blob by other methods. You can find hot air blower - wich is kind of dangerous as it might melt further parts of your printer. Or use soldering iron. Luckely I did not need that but I assume heating up the metall of the nozzle if reachable might help to get most of the blob removed easily. I just can give the advice to stay patient, act carefully and use not much force - if the blob is warm enough it will come of easily - be careful of course it will be extrem hot in some parts.
I had that blob experience twice after, lucky me on an earlier stage as I was randomly looking at the print. I can tell even stairing at your prints will not hinder the printer to create such blobs as you need some seconds to realize what is going on and than you try to stop the print in a hurry which is normally taking longer than you expect. Plus you don’t want to run the printhead in the stop position over the p*** shoot as the hot blob might damage more than already is damaged.
Basically I think this “watch your print” advice is kind of not realistic and will not prevent this event from happening - may just make it less terrible.
If you still have trouble to remove the blob - let us know here. I will try to find the other tutorials that I found for this topic.
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BEST ANSWER! 
This is what i do.
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I damaged my hotend assembly trying to clean off the blob. Is it possible to repair the assembly or am I looking a purchasing a new part?
What part of the hot end did you damage?
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The bronze wires connecting to the assembly
Cheapo toaster oven set to 350 degrees will liquify the filament easily.
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I’m here becuase my A1 Mini has stopped communicating with the toolhead after only a few days (it was a Christmas present). However, I am being given instructions from the support team to take it apart - which feels like I need to be a trained electrician, engineer and mechanic. Is this normal for 3D printers or just Bambu?
It was and remains standard for every printer from the box… except for Bambu. As in you build the printer from parts when it’s delivered. The fact you’ve been printing without getting your hands on tools until now is thanks to Bambu. I would suggest getting very used to it.
Bambu’s hardware maintenance instructions tend to be foolproof and very easy for novices to follow - I would say give it a shot, but make sure you read everything 3 times before doing anything.
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I made it maybe 2 months before I ran into a major print failure causing breakage.
Been trying to deal with support after replacing the hotend (failed print damaged the wires).
Support is meh but when the printer is running the A1 is fantastic.
3D printers are still something where it is somewhat expected that you will have some basic mechanical and electronics knowledge - i.e. enough to be able to do at least some basic servicing. I would have hoped that support asked you if you felt comfortable in doing that, or returning the printer under warranty depending on what the exact issue was (I.e. it may be better to return to prevent further damage to the printer). As clearly it may be both quicker for you, and cheaper for them if you can identify it to be say an issue with the toolhead board and they just send out the replacement parts for you to fit. Plus you get a better understanding of how it all fits together. At least that is the case until “3d printer repair guy” becomes a commonplace job 
Old thread but heres my issue that got fixed and its partly my fault. The issue isnt my fault but other things were which ill get into.
First I kept getting filament cutter stuck/ filament sensor error. Long story short, did all the troubleshooting it was the filament sensor.
Now for the part that was my fault, I thought I could save some time by ordering the replacement part on Amazon. I know Bambu Lab doesn’t sell on there so I took a chance, gambled and lost. The part I got from Amazon was straight up counterfit, not even a part taken out of a parted out A1 so after a month trying to figure out what was going on and contacting support. I decided to buy the filament sensor from Bambu and then I compared the two.
The one from Amazon didnt have as long of contact points like the legit one from Amazon and the writing on the sensor was different.
So after placing the Bambu sensor in it worked.
Moral of the story just buy from Bambu
But back to the printer I only had the printer for a week and a half when it crapped the bed.
Completely new to 3d printing and just started with the A1 a few months ago, so far no issues and only failed prints because my own bad designs due to no experience with it - I’m very impressed with what this thing can do.