Hello, I’m having a problem with the left nozzle. It prints terribly, while the right one prints fine. I’ve tried:
Bed tramming
A spare hotend
Factory reset and calibration
Many other things
I’ve been in contact with support for a week now, but haven’t received any solutions yet.
Has anyone encountered a similar issue?
Had the same but mainly with the right nozzle (but also to some extent with the left). Found no solution even with the support.
Just a friendly note: bed tramming should always be the last resort. On the H2D and other modern printers, automatic compensation handles minor bed imperfections quite well. Manual tramming can actually make things worse if it’s not done correctly.
Also, are you using the exact same spool when switching between the left and right extruder? If not, the issue could be filament-related rather than a problem with the printer itself.
For example, I had two spools of PETG-HF in the same color on my X1 Carbon, and they behaved completely differently—one adhered perfectly while the other consistently lost adhesion and got ripped off the plate.
Yes, the same spool of filament was used.
Well, this is certainly interesting. The slicer allows you to set a different flow rate for the first layer (what it calls the “bottom” layer), but IIRC, it doesn’t distinguish between left and right nozzle. If this is a thing, maybe Bambulab will have to add that distinction.
That said, you could work around that limitation by creating a separate print profile for left vs. right nozzle.
Had a similar issue with left hot end, after loosening the transportation screw under the bed fixed my problem. If that does not help, lots of other things to try in this guide:
Have you tested with the bed to (on) and not (auto) mode?
What type of filament are you using?
What is the temperature of the nozzle?
Have you tried lowering it in 5°C increments during printing to see what happens?
I did it as stated in the bed tramming instructions
can’t say for sure, I have a much better result after tramming and it only costs like 20 australian dollars to get a usable dial indicator.
i also had to remove that 3 transportation screws. they were causing a minor bulge on my bed that somehow only affect my left nozzle (right nozzle prints fine even before adjustment).
But now i get perfect first layers from both nozzles, and i’m happy. 
Always “On”
Bambu Basic PLA
220
Not yet, gonna try this today/tommorow
Thanks for reply, already done. No change
Also watch on the lcd screen that the nozzle is dropping down from 250c after it purges to you first layer nozzle specs this has been a glitch and is very interment it will stay at 250c
Ya try a lower temperature of 5c drops to check if the left nozzle is running too hot and overheating the PLA filament.
Let set what happens then you can start changing more settings.
The temperature displayed is correct. I tried lowering the temperature, but there was no change. I will try adjusting the Z-Offset for test
Did you also do the nozzle offset with two colors ?
I was just thinking the left nozzle is it sloppy in the clamp up and down ?
Ya next step is global plus z offset and first layer flow drop in 5% steps we now know left nozzle thermistor is reading in the ball park now.
I don’t know if the Bambu lab h2d will allow per nozzle z offset in start g-code with M218
I don’t know if you could have a z offset in the filament start g code and use a left nozzle profile for now.
It would take testing or reach out to support do to they know the g code firmware rules.
I haven’t performed a dual-color calibration, but I’ve adjusted the temperature and offset. In general, I’ve followed all the recommended steps from the wiki related to this issue, but there’s been no improvement. At this point, I’m completely out of ideas, and I’m really tired of struggling with this. Thank you to everyone who’s trying to help. I truly appreciate it.
I have this exact issue. If I print normal objects however the first layer is perfect with both nozzles. I only get bad first layers when I do a print that’s as big as the one you did or whole sheet. I sent support my log files and they wanted me to tram, tighten base ceramic screws etc. they now still believe it’s the left nozzle for me. I think it’s just the way the printer calculates the first layer if anything. Have a larger deviation causes the algorithm to get all funky perhaps, no idea. Right side is absolutely perfect for me.
Try using the dual color filament offset to see if it resolves the issue. If that doesn’t work, the only remaining option for now is to set a custom filament Z offset setting for the left nozzle only or you could experiment to find a balanced setting that works for both nozzles.
G29.1 Z0.01 ; Include this in the filament start G-code for the left nozzle PLA preset
Adjust the Z gap in 0.01 increments, either increasing or decreasing as needed.
Save preset:
You could also try using a 0.24 mm first layer height along with Z-offset adjustments with your PLA.
You should be able to get the first layer perfect with some fine-tuning or by adjusting the Z offset.
Have you checked this ?
Yeah already done that. At this point I think it’s software perhaps because prints that take up the entire bed have bad first layers. Bambu now wants me to do a whole bed test not splitting right and left, but one doing only the left and one only doing the right and to send them photos so we shall see
