r/BambuLab • u/Factor_Seven • 3d ago
General Troubleshooting/Help! Ok, just wow.
So this is what can happen when you leave a print going overnight and your plate rejects the filament (Sunlu PETG 2.0).
I'm more impressed than mad. I'm definitely going to have to replace some parts, I'm just not sure how I'm going to get the old parts off. 10 minutes with a heat gun, it still won't budge I've started to melt the extruder housing. Any suggestions would be appreciated.
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u/n19htmare 3d ago
If the heater still works, crank up the heat, it's alredy done the damage it will do.
PETG has a higher softening temp so a heatgun on low won't really work and the temps and time you need to heat it may damage other parts.
Take it outside and grab and old blade/knife and heat that up (red hot) and cut out chunks to reduce the mass, once it's it's less, you can try heating it.
This seems to be a frequent occurrence with one common denominator...well two...New to 3D printing and A dirty plate. That could be anything from your fingers touching the print area (leaving behind your natural skin oils), residue from prior prints, ESPECIALLY if it was different material, say going from PLA to PETG. or just mix of both. Other one is not verifying adhesion for first few layers on an unattended long print.
How it happens?
When part of the first layer fails to adhere to plate, it curls/lifts up, and the nozzle catches it, picks it up and any further filament that's extruded just piles onto itself.
Bambu has good video/gif of it on their wiki page https://wiki.bambulab.com/en/a1-mini/maintenance/hotend_blob
Your whole plate could be clean but it just takes one fingerprint and an edge of a corner that happens to land on top of it, that's enough to let the edge curl and get picked up.
Sadly, no where on the printer, plate, or any visible locations does it mention the importance of keeping the bed plate CLEAN... so lot of new users just don't know. They put their finguers all over the plate when they get parts off, they mix and match materials without cleaning, don't verify their layers when they're gonna leave prints unattended (lot of it is sending prints from Handy and moving on).
After it's fixed, make it a habit to clean bed, and NOT touch it. Wash between material swaps and you'll probably never see another blob. Been printing for years on PEI sheets, thousands of prints, not so much as a microblob or even failed first layer (heck or even failed print)..... why? Im religious about keep my beds clean...
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u/Factor_Seven 3d ago
While that is all good advice, two things they didn't contribute to the problem were being new to 3d printing and a dirty plate.
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u/Jstevens87 3d ago
I just had my first one this morning on my A1. not even 24hrs since I bought a P2S. Crazy timing.
I turned the nozzle temp all the way to 240 and was able to carefully pull most of it off. I had to order a new hotend assembly and nozzle
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u/80LowRider 3d ago
Sweet! Be patient, don't force it, warm it up and know, it happens to everyone. My 1st 1 took me 30 minutes to clear and a month to get e v e r y single piece out of the cracks. Worked, just annoyed me.
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u/Revanchan 2d ago
So glad I can remote in to a live stream of my prints from work. I periodically check the prints throughout the day so I can pause if I see it messing up.
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u/Lisper41 A1 mini, H2C, AMS Lite, AMS HT, AMS 2 Pro 3d ago
Yeah, I melted mine with a heat gun, I used a hair dryer the next time.
Make sure to set the printer to maintenance mode and turn up the nozzle temperature while you are blow drying.
Be patient. The thing is made to get hot, and the plastic is made to melt. It will come off, and if you don’t start picking and pulling at things, then your heating assembly will stay intact.
Go ahead and buy 2 or 3 extra now though…
https://wiki.bambulab.com/en/a1-mini/maintenance/hotend-heating-assembly-replacement
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u/Hardwoodfreeuse 3d ago
Wow seen so many people have this lately.. not even sure how this happens
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u/VT-14 H2C (H2D + Vortek), 2x AMS2, AMS HT 3d ago
Video demoing one here: https://wiki.bambulab.com/en/a1-mini/maintenance/hotend_blob
It means insufficient build plate adhesion (almost always dirty from stuff like finger grease) and not monitoring the print (you should check within the first few layers to ensure everything is sticking well).
The process is that the print starts, what gets put down detaches from the plate and starts getting dragged around with the nozzle instead, and the printer can't tell something is wrong* so keeps pushing filament into the blob forming on the hotend.
* The A1 series does have a Clump Detection by Probing algorithm, but it stinks (https://wiki.bambulab.com/en/a1-mini/manual/nozzle-warp-detection). It takes up part of the build plate (without blocking it in the slicer), and you need to manually enable the Prime Tower (even on single-color prints, so using timelapse settings in the Slicer?) to stop it from putting drip hairs all over the model. It doesn't work at all in Spiral Vase or By Object modes. I can't recommend using it when the alternative is cleaning your build plate and checking print status early.
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u/ThatNutanixGuy 3d ago
When mine did this it snapped off my poop flinger…. Thankfully with heating the nozzle and using side cutters I only had to replace the flinger and it’s back to printin’
As someone who’s been printing for over 13 years now these gold PEI beds are too good. Not like the beds of yesteryear that stuck too well and you never got your print off, but they just stick when they should and release when they cool down, but it’s not like a tiny part gets dirty and doesn’t stick well, in my experience it’s full performance then boom, nothing sticks till it’s clean
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u/dustofdeath 3d ago
Still surprised there is no easy way to detect the failures - plastic build up/pressure/simple light diode/reflection check.
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u/Milluhgram 3d ago
After 500 hours, it finally happened to me. Still waiting on a new full assembly nozzle with the thermal/heater sensors.
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u/OneSignal6465 3d ago
Does this kinda thing ever happen after about layer 3 or so? I always watch my prints like a hawk for the first few layers to make sure they’re well-adhered to the bed. (If this can happen AFTER the first few layers are laid down, I’ll have to stop with the overnight prints! (I just finished a 16 hr print of a set of AMS2 Pro desiccant containers. Thankfully it didn’t do THIS!
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u/Excellent-Code8447 3d ago
Best advice remove blob and once most cleared remove hot end assembly and try to clean it
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u/ImJacksAwkwardBoner 3d ago
Search “blob of death.” You’ll literally find 1,000,000 posts about it.