I keep getting false positives saying “AI detected nozzle clumping. Please check the nozzle conditions.” When I inspect the nozzle everything looks fine, so I hit resume and the print continues with no issues. This has been a real pain for overnight prints because they stop in the middle of the night and instead of awakening to a completed print I have to clear the false positive.
I watched at least one YouTube influencer who mentioned having similar problems. How common is this with the H2D? I never have this issue on my X1C. Is there anything I can do to prevent or reduce these false positives?
3 Likes
On my X1 I have the AI fail detect sensitivity set to “low” to prevent false positives with spaghetti etc, not sure if that setting applies to the nozzle AI on the H2D.
I had that issue constantly for almost two weeks. Now it gives a message about an heating issue, nozzle temperature malfunction. Which I’ve replaced the nozzle and stuff last week and now same issue. First with the false positive yesterday and then today message about the temperature malfunction. BL sent me replacement parts but I’m not sure what is going on.
1 Like
Nozzle temp malfunction is usually related to the heater or thermistor. Sometimes in more extreme cases the TH board.
I’ve had several false positives from mine as well, especially with the “Rugged Drawer” model on Makerworld which has a mesh pattern on the side that appears to fool the AI. Even on the low AI setting I was getting a spaghetti warning on every layer. I had to turn it off completely to finish the print. Two days ago a false positive pauseda print in the middle of the night and when I restarted the next morning the print ended up with a layer separation on the layer where it paused.
It’s pretty frustrating. My X1C had maybe 1 false positive in the past year.,
I was having the same problem. It would sometimes run for 10 hours with no issues, and sometimes throw the nozzle clumping error an hour apart several times in a row. It even did it with the AI settings on Low, so I ended up just having to turn the AI detection completely off.
Since I haven’t been printing anything with risk of print failures, I haven’t had an issue without it, but I’m hoping there will be some improvements in the works via firmware update in the future.
Hi, I´ve had the same false positives, but only with certain brand of filament - in my case it was black PETG from Devil design and some PETG from Fillamentum. Changing the brand helped in my case.
I basically have the same issues. I can have a full overnight print without any and suddenly I receive so many that I have to turn the AI detection off mid-print because, I receive them every 5 minutes.
Using exclusively Bambulab Filament (as this happens to be what I have since I got the H2D) and a 0.4mm and 0.4mm HF nozzle are installed, currently.
1 Like
I’m getting a LOT of false positives for spaghetti when printing a file that consists of a set of dark objects overlaid with a white hex grid. A LOT. Will try turning the sensitivity down IF I can find the setting 
2 Likes
Same here, the AI detection is considerably worse in terms of false positives compared to my X1C.
Specifically, the nozzle clumping detection has ruined several overnighters for me as there is layer separation after a long break from a false positive.
I have also now disabled Ai detection altogether until Bambu hopefully provide a meaningful sw fix.
1 Like
installed the H2D today. First print, estimated time 3 hrs, after 1 hr the printer stopped, warning message “nozzle clumping”. Never received a message like that on my X1 carbon (in use for 15 months now`). how to prevent those messages? Rather annoying if you want to print an object with a printing time of 9 hrs and yiu want to print during the night.
1 Like
I got the same error Ai detected nozzle clumping, almost after every layer, so I wiped the front of the nozzles off with a tech “q-tip” and ipa got the “fuzz” off and no more error, someone had suggested turning the ai cameras off but I didn’t do that. still printing fine. I do think the ai is too sensitive.
I guess the question becomes, can I turn it off during a print?
I got my H2D a couple days ago and it’s definitely triggering these false positives unacceptably frequently. I’ve printed “Planter with Legs” by SabreDesign on Makerworld twice on the H2D at this point, once in Bambu ABS black, once in Voxel PETG+ black. I didn’t calibrate the ABS as it’s a Bambu filament, but I calibrated the voxel filament before using it. The ABS tripped the detection 6 times during print, with detection on low. The PETG triggered 3 times before it even hit layer 60, and I just got bored resuming and switched off AI monitoring entirely in print options. In none of these cases was anything even on the nozzle.
I’ve not had my X1C trigger a false positive while printing this model even once, with the same filament, off the same spool even. Filament’s dry, and AMS2’s reading 10% humidity so it’s not like it’s becoming wet while printing (I live in a dry climate anyway).
1 Like
I’ve never experienced the nozzle clumping issue, but I have encountered the air printing error a few times, despite everything being perfect. It’s a bit frustrating. However, I’m optimistic that this will be addressed in future firmware updates and with additional data for the AI to learn from.
1 Like
I’m now getting a LOT of these false positives (which are a nuisance on 24-hour prints), despite turning AI detection to “low” 
Not sure that I want to turn AI detection off altogether; I’ll try cleaning the nozzle and camera later.
Would be interesting to know if the false positives are related to the color or texture of the material you use.
1 Like
I’m starting to suspect there might be something going on with the flow dynamics calibration, which is very material dependent. The prints I made with ABS and PETG earlier that I was complaining about both were absolutely full of stringing and zits on the surface. I’m gonna go look for a smaller model that shows this problem well and see about printing a couple of them, some with manual calibration and some with the flow dynamics calibration turned off, and see if it produces a significantly different result. That, and test the results of the calibration process between the included textured plate vs the smooth plate, because I know the X1 had issues calibrating on the textured plate so maybe they hit the same issue again?
Anyway, if my hunch is right the false positives at least for me are being triggered largely due to the poor quality of the print in general, and hopefully fixing the print quality to be more like what the X1 produces will clean up some of the false positives too.
There was another post about USB drive speed causing issues. Seemed unlikely the cause, but easy enough to check out…
After I did a little research and couldn’t find any speed information for the one I was using, I bought a highspeed USB stick, so far three days and no false clumping issues… I am hopeful the issue is resolved.
Same here. First 10h or different prints and three false errors. USB Samsung Fit Plus 64GB USB 3.1 300MB/s, so speed is not an issue. AI detection set to LOW. Last time I saw there was a harmful short piece of old filament on a second nozzle, maybe that is why system decided that there is a problem.
I wish to have the “advanced” option to disable only selected AI features, not the hole system.
PS: while I write this another "nozzle clumping appeared, probably because of lost poop behind poop chute. I will disable AI for now.