Being able to use different nozzle sizes on each extruder would allow for one nozzle to print infill or support material while another would provide fine detail (i.e., 0.2mm).
What, no love for the H2C?
Seriously, though, itâs been in development since before the H series release, but Bambuâs CEO is on record stating they wonât release it unless they are fully confident in itâs performance.
Did not know that the H2C would be a candidate or I would have added it.
It seems that other slicer that starts with an âOâ is supposed to support it, but have not yet tried it. Iâm probably treading on dangerous ice here, but perhaps Bambu Lab could lift that code? 
Orcaslicer can handle multiple nozzle slices in the abstract sense - it can toolpath prints using two different nozzle sizes, but it doesnât have any of the H2C-specific stuff that the printer needs to actually do it. All of the reliability, error detection, etc. stuff isnât in Orca.
Not defending Bambu at all, I really think theyâve had enough time, and if not, then the H2C Orcaslicer developers should do it and let the open source community develop and test it collaboratively.
Thanks for the clarification.
That would be awesome idea . Letâs hope they manage to do this
I know. The other reason this is really important for the X2D is the auxiliary nozzle canât print material well at 0.2mm. Thatâs a limitation of the Bowden extruder.
This means when using a 0.2mm nozzle the X2D is effectively a single nozzle machine.
Please make this happen. It would even be helpful on a layer-constrained status.
The X2D cannot really be compared with the H2D, because of the reason you mentioned.
The main reason of the auxiliary nozzle on the X2D is to use it for support material, and the Bowden extruder is perfectly fine for that.
That doesnât mean you canât use it as a full dual nozzle system but you must accept the limitations.
Speed and quality might be less on the auxiliary nozzle, but still acceptable for the job at hand.
On the other hand, if you would be looking at the dual size requirement in this post, putting the 0.2mm on the main nozzle and another size on the auxiliary, would be working fine then.
Iâm finding that true with my new H2D.
The request for printing with mixed size nozzles , will be here in the 3rd quarter , with a little luck it will be with bambu lab too , my assumption for this feature would be with the H2c and X2c if the latter comes into fruition, at least to start.
While developing H3C, we are also developing multi-diameter nozzle printing capabilities for H2D, H2C, and X2D. This will allow you to use different-diameter nozzles on the same print, balancing detail and speed.
Please follow software updates for specific adaptation timelines for each model.(Hyperlinks will be updated at 10 PM Beijing Time~)
From the H3C wiki on the subject
Link? I canât seem to find that anywhere.
I just downloaded BS 2.9.1.70âŚAfter reading this, I got excitedâŚBut alasâŚOnly for H3C at this point it seemsâŚ
New Features
Mixed Nozzle Diameter Slicing and Printing
This is the most important update in this Bambu Studio release.
Printing with multiple nozzle diameters is not a new topic. Previously, users could assign filament and nozzles by slicing line type such as wall, infill, and support, for example, by setting the filament for sparse infill, solid infill, and walls on the Process > Strength > Advanced page. What is different about this update is that Bambu Studio extends this capability into regions of the model: within a single model, users can assign nozzles of different diameters to local details and to the main body, and let each nozzle print at its own appropriate layer height.
For future reference.
Now if this comes to fruition⌠we will squeal like itâs Christmas morning. Have a P1S, X1D, and bought the H2D yesterday. Had buyerâs remorse at first since I really need dual size nozzle compatibility and itâs not (yet) available for the H2D but comes built-in to the H3 software. Would love further updates as they become available!