Hello. I couldn’t find the solution. I got warning/error that my cutter blade is stuck. So I took it out using instructions and it was ok. So I unplugged fillament hub and noticed that it was very sticky. The spring under it was very sticky. It was clear and it didn’t looked like lubricant or something. It was like clear paper glue. Is it supposed to be like that? Also the warning/error about cutter blade didn’t cleared. It’s still there and I don’t know what to do. And It can’t let me load fillament. Blade seems to be ok. Printer is pretty new still. Shoud I completly disassemble the toolhead? Thank you
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I had the same issue a few weeks ago. I removed the filament hub (there are plenty of videos on Youtube that show you how to do it with breaking anything) and sprayed it with WD40. It removed the sticky junk (it reminded me of melted hard candy) and I also sprayed some on a paper towel and wiped out where the hub inserts. I ran a piece of filament through all four ports of the hub and reassembled. I have not had an issues since.
I have no idea what caused it and hopefully will not have to deal with it again.
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Thank you will try. I was surprised because I never had it open and this sticky goo looks like it shouldn’t be there. It caused my cutter handle to stay inside.
Yes this helped. Thank you. I did little bit more. I also cleaned the gears because some of them had also that sticky goo on them. Cleaned also stuff around sensor because that was the main issue. First print looks ok without problems. No errors on sensor.
If I encounter that issue again I will do the same.
I recently got my A1 Mini Combo and it arrived in a very damaged box but luckily it was OK, Bambu Support told me to run some tests and report back and I also asked some questions, one of these was to do with the Filament hub as I encountered this sticky substance as when I tried to remove one of the PTFE tubes to install another one with TPU in it using the rear spool mount because that filament can not go through the AMS lite I have been told and read.
The response from Bambu was that the sticky substance is actually a lubricant for long term storage in the warehouse and it is not a problem , its quite normal and they told me to simply plug the hub back in and carry on.
I intend to purchase an additional filament hub for use with the rear spool and simply switch hubs rather than remove one teflon tube and replace it with another from the rear spool. I’ll store the unused hub from the AMS lite in a small plastic bag to stop the lubricant touching other parts of the printer.
They told me that was fine to work that way.
The amazing internal packaging really protected my printer despite all the damage to the outside of the box, it had been crushed in places and the the top 1/4 of the box had been sliced through on 3 sides as well but had held together.
So far it’s a great little printer and for me suits what I want to print locally rather than on my CR10’s , tempted now to buy the A1 as well and share the AMS lite between them as needs be as its so cheap at the moment.
I’m assuming in the Autumn/Fall there will be a release of new models.
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Well that sticky substance flowed down to my cutting blade sensor and it had to be cleaned. That was my main issue. After cleaning sensor and space around blade, all was good. Didn’t replaced any part.
That’s a bummer, I expect there was too much lubricant applied in the factory , mine had hardly any in, can see why you cleaned it though!! 
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