By the date of July 30, 2025, the Bambu Studio version 2.1.1.52, the Bambu Handy version 3.3.0, the following issue has not been fixed yet. According to the Bambu Handy ticket, the team has found the issue and is working on fixing it. The bug will be fixed along with other issues in the coming new versions, for example, the bed leveling cancel issue.
For users who have multiple models, you might have noticed the issue for quite a few months. It happens every time you change the target printer that the app gives you. For example, you started a printing from the printing history or the makerworld, and wanted to print it on your P1S, but the given printer is your A1 Mini, which is not a compatible model with the printer, and the settings are normal. Then you change the target printer, the issue happens, and the bed leveling is canceled. It happened every single time. If you forget to turn it on, your prints are going to be ruined.
Back to today’s Issue. Everything you assigned to the left nozzle will be recognized as the right nozzle. Since we cannot modify the sliced file from the printing history, this issue makes people slice the same print repeatedly to reprint, which is quite annoying. As I mentioned before, I use a second AMS 2 Pro and an AMS HT on the right nozzle, so I don’t know if this issue happens to those who use a single AMS 2 Pro. And this issue hasn’t been found in the previous versions.
Let’s review this issue.
So, I put a silk rainbow PLA in the left AMS 2 Pro, it is connected to the left nozzle. And I use the specific material for slicing.
We can tell that from the dashboard when it is printing.
I didn’t find the issue until the second dragon. I removed the first dragon in the morning, then went out for work. When I stepped on the subway. I tried to reprint it from the record, but the new task was forced to print on the right nozzle, but the material is clearly on the left nozzle, which means I must do one of the following things:
1, Put the material into the right AMS 2 Pro
2, Slice the same file again from the computer
Both option sucks, I don’t want to go back to adjust those spools, either slicing it from my computer at the office. This issue will delay your task while you are not near the printer and have access to a PC.
The first option is not a good idea, because the issues also happen when using both nozzles for multi-color printing. And most people are using third-party filaments, which also means that you need to set the materials and colors again. Anyway, it wastes your materials or time.
So, I started to test this issue and found more things.
First, this issue happens 100% when slicing on a computer and both nozzles are assigned with AMS. Second, the printer knows it’s printing on the left nozzle, it just gives a wrong record.
But this issue has revealed something that Bambu Lab doesn’t want us to know. The H2D can use materials across nozzles, you might not need a second AMS.
I mentioned some features about the H2D in Best 3D Prints that Make Your Bambu Lab Printers So Much Better Part 3, one of them is filaments are not shared across nozzles, even it is the same material with the same color.
I noticed that the H2D does not continue printing with the same material from another nozzle, even if the print is in the cross area. The Technical guys from Bambu Lab told me that the code was generated and cannot be changed right after the printing starts. Continue with the other nozzle that requires changing the g-code.
It does make sense, because we can modify presets from Makerworld on Bambu Handy, but we cannot do the same thing on our files that are sliced on a computer.
But this issue clearly goes against this saying. The printing nozzle has been mixed, which means it can be changed during printing. Then the printer thinks the material was on the right nozzle while it is on the left nozzle. What if we put the same material in that slot, or if it is already the same material, will the printing go on? Of course, yes. That means printing can be continued on the other nozzle by using this issue.
Then you don’t have to buy a second AMS for the right nozzle.
Anyway, this issue is against the TOP features of H2D and makes it annoying to use more AMS. I hope the Bambu Lab team can solve this issue ASAP. After all, multi-color printing via dual nozzle saves time and material, and dual material printing is one of the top features of this machine. This bug is against those features.
