I’m sure it’s my error, but is there anything I can do to prevent this from happening again?
The nozzle itself is clean.
Printing with Bambu’s default settings for PETG-CF, and the standard H2D hotend’s
could wipe some ptfe oil on it(the areas that get buildup). Did it slide down and drag on the print? They fit very loose.
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You can reduce the incidents of this by making sure you dry the PETG-CF thoroughly before every print, even when it is fresh out of the bag. You can also turn down the sensitivity of the clumping detection but that can lead to a blob around the nozzle dragging on the top surface of the print and spoiling it, don’t ask me how I know!
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Is that a thing? I mean the “wipe some ptfe oil on it”.
Does putting PTFE oil on the nozzle (or silicone cover) actually help reduce filament from sticking to them?
Yeah. Fugured it out because of some x1c revo nozzle i used, loved to vacuum up bit of plastic and then rip over time. Never tried it on the actual nozzle, for that I have Slice engineering plastic repellant, which sorta works.
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sadly they degrade at 270C 
meaning that I would have to swap nozzles to prevent myself from exposing with degraded PTFE toxins when trying to print higher temp materials than ABS/ASA.
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Or the internal filter will take care of them along with all the toxins from the filament. Hopefully lol
I come from a time when the ptfe tube was butted against the hotend and was the heat break. Had to swap the little section out every so often. No enclosure.
Before that, we didnt have silicone socks. We wrapped the hotend in kapton tape that stunk the first couple times you used it. Sad days lol
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I’ve been spending too much time watching my H2D perhaps, but I’m starting to think the whole nozzle wipe process and these silicone socks might be a problem. One morning I found the sock tossed on the bed with the bottom torn open/out. It seems like when it travels over the wiper it takes a beating. Often it will dislodge it or twist it slightly. Tonight I saved it by using my long tweezers to knock it back in place before it fell off. Not sure if it contributed to your issue but it might be something you could keep an eye on.
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I haven’t noticed any issues with the sock, but I’m getting constant clumping on my H2D (0.4mm nozzle) with Bambu PETG-CF as well. With the PETG-CF the printer AI pauses the print every 25-45 minutes or so.
I used Elegoo PLA-CF the other day without issue for a ~2hr print without any clumping on the same nozzle. I’ve also printed with normal PLA, PETG, and TPU 90A without any trouble. It’s only this PETG-CF that has caused problems so far.
I have tried drying it out, but that provided no improvement.
In another thread someone recommended a higher nozzle temp, that didn’t help either.
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you’re not the first one to report that, i assume it’s a common issue as i’ve seen many reported that now
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Bambu PETG-CF (all most petg especially CF in general) are very notorious for clumping, I would say the ai detection actually worked this time which is … good?
The reason it clumps so easily is that bambu skipped coating the outter rim of the nozzle with anti sticking coating. So it’s just a matter of time that clumping happens for sticky filaments like PETG-CF.
I’m just waiting for Phaetus to release their conch plus nozzle for H2D. Before that I don’t want to spend too much of hussle on Bambu PETG-CF
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