I print 1 part, and 1 part only. Its a 3 day print on X1 Carbon. Needles to say I have this dialed in on the X1C. It is a PLA part that I use PLA/PETG supports (interface only) to get a flawless print. I bought the H2D to save on filament and print faster. That hasn’t happened yet.
I am using the H2D AMS and an old X1C AMS. Sliced every way I can, tried several support types. Software is all up to date. H2D calibrated many times. Bambu OEM filaments. Tried support filament on either extruder head, and either AMS. The print itself comes out OK, but the extruder gets constant dirty nozzle errors on PLA (when not clogged or dirty at all), and Support/PLA adhesion frequently fails, something that doesn’t happen on the X1C. Take a look at this picture and let me know your thoughts on what is going on. The support material shows severe stringing only on the support tower, not on the print itself.
Happened to me printing PAHT with ASA supports. When the nozzle change happens before the ooze guard pops on and right after it gets removed from the other nozzle, there is some filament oozing from the hot ends, my prime tower looked identical. If you watch it print you can see before it does the first line on the prime tower it does a routine on the edge of it to anchor this ooze. I think everything is working as intended if your model print is clean.
I did turn down the AI sensitivity to “low” on mine to avoid false positives, I had no errors during printing.
I’m using regular. I ordered a few minutes too late and missed out! I can imagine the HF nozzles having a bit more difficulty in retracting due to the geometry…
Are you concerned about the oozing on the purge tower? If so… stop. That’s what the tower is for. That is the whole reason there is one. You prime the nozzle and put the zits and oozing on a sacrificial print.
Now, if you are seeing similar stringing on the model, that’s a good reason to complain. As far as the error notices, I’m not sure you can do much without compromising the AI features. That oozing is significant, and IMO, should trigger an error. You can change the threshold on the AI features, but I don’t think I would. Its working as it should work.
What can you do to help with the stringing? Personally, I would look at printing at a lower temp for the PETG. Or maybe increasing retraction… or both. You can probably tuning it in if you want to spend the time on it.
Here is the part I was printing - I’m extremely impressed by my first print with “Support for PLA” (old version - was a sample that came with my P1S) - the massive overhang didn’t curl up at all!
On the topic of PETG interface layers - “PETG-HF” prints at a much lower temperature by default than PETG - this could be a better support material than regular PETG (apart from the extra drying it needs).
Do the nozzle spacing calibration to improve print quality. As far as adhesion, im not sure if the main print is pla or petg. Where you were doing it on one nozzle with the X1C I’m thinking your interface filament was actually going down hotter or cool (depending on your actual main filament) than it is on the H2D. Aka your temps being better controlled on the H2D is actually causing the issue. You likely need to adjust temps on the interface filament by like 10 degrees and you’ll have better (or more expected) results.
Oh, and as far as the “dirty nozzle,” just turn down the sensitivity in settings. Things like the blob detection and spaghetti detection will likely need some tuning by Bambu for a while.
Today I received the 0.8 mm nozzles and decided to print a poop bin using two colors. This made me realize that the 0.8 nozzles might not be the best to use in multi-color prints Printed using Bambu PETG-HF, dried before and ran an auto flow dynamics calibration before starting the print.
I will say, those layer lines that are clearly visible where it’s doing the filament changes are also a thing when using the 0.4 nozzles. Does anyone have any tips on how that can be avoided, or reduced? The way it is now makes it basically useless for me personally (it’s just so ugly when compared to the parts where only white was used).
Another tip perhaps for @SupportAssistant, could it be possible to load both filaments at the start of a print? Right now it will wait to load the 2nd color until it is needed, but this causes a clearly visible offset layer line shift (because it’s pausing the print a long time to load the filament, similar to X/P/A printers).
I’d hazard you’re hitting min time. Easy enough to see in the flow rate vis during slicing. You could also try cutting the model around that line and disabling ‘slow printing down’ as a test.
Thanks for the feedback. I was just shocked at how the tower looks because my X1C doesn’t do this. Also, the X1C does not have issue with adhesion between the support material and the PLA. The H2D does.
Printed using Bambu PETG-HF, dried before and ran an auto flow dynamics calibration before starting the print.
