The warning is used for the following messages:

• "\"%s\" part's mesh contains errors. Please repair it first.

  OrcaSlicer/src/slic3r/GUI/GUI_ObjectList.cpp

  Line 5950 in d6761fe

  WarningDialog dlg(static_cast<wxWindow *>(wxGetApp().mainframe), (is_part ? _L("Part") : _L("Object")) + " " + content, _L("BambuStudio warning"), wxYES_NO);

• "\"%s\" will exceed 1 million faces after this subdivision, which may increase slicing time. Do you want to continue?
  

  OrcaSlicer/src/slic3r/GUI/GUI_ObjectList.cpp

  Line 5961 in d6761fe

  WarningDialog dlg(static_cast<wxWindow *>(wxGetApp().mainframe), content, _L("BambuStudio warning"), wxOK);

The setting is displayed for all filament profiles in advanced mode, but only works with BambuLab filaments (profiles with pre-configured filament_adaptive_volumetric_speed model). Moreover, currently OrcaSlicer doesn't have a single filament profile with non-zero model, so displaying this setting doesn't make sense. I think it should be only visible in the developer mode (ideally, with a disclaimer in tooltip, not only in the wiki).

• Flushing and notch at the starting point — added flushing actions for the interface layer: the nozzle wipes before flushing (rather than after), then prints the prime tower directly (release notes)

  The notch (skip points option) doesn't work with regular profiles, only with BambuLab ones:

  Demo

  	Bambu printers	Regular printers
  Enabled
  Disabled
  3MF	[Skip points] Bambu prime tower.zip	[Skip points] Regular prime tower.zip

• Extra pre-extrusion before the interface layer — before printing the prime tower, the interface layer now performs a short pre-extrusion (release notes)

  Changing Pre-extrusion distance/length do nothing even with Bambu printers (check the attached gcodes using a diff finder):

  Demo and gcodes

  

  Pre-extrusion and length do nothing.zip

• Improved ironing strategy — ironing is no longer applied to the interface layer. A configurable ironing area parameter is added (release notes)

  The spiral tower ironing moves aren't applied to printers other than H2D:

  Demo

  H2D	Other printers
  [Ironing] H2D prime tower.zip	[Ironing] Others prime tower.zip

  Bambu Wiki says that this feature requires Skip points to be enabled, so that may be an additional reason why it doesn't work for regular printers. But as you can see above, it doesn't work even with BambuLab A1 with skip points applied.

  Also you can see in previous demo that I changed ironing area as well, but the only difference in the code is in the settings section.

I didn't check other features added in #12266, but I'm afraid all of them are broken.

The Internal ribs option also doesn't affect regular printers: OrcaSlicer applies a different tower algorithm for non-bambu printers, that shrinks the tower when the interface volume is lower.

Demo:

	Bambu printers	Regular printers
Enabled
Disabled
	The tower width remains the same, ribs can be generated	The width is automatically reduced, no ribs in both scenarios
3MF	[Internal ribs] Bambu prime tower.zip	[Internal ribs] Regular prime tower.zip

1. Filament grouping wiki (3 places) refers to a local Bambu Studio .html, which doesn't exist in OrcaSlicer [Fixed in #12880]

   Demo

   Grouping popup
   OrcaSlicer/src/slic3r/GUI/FilamentGroupPopup.cpp Line 150 in d6761fe const std::string wiki_path = Slic3r::resources_dir() + "/wiki/filament_group_wiki_zh.html"; // NEEDFIX this link is broken

   Preview legend
   OrcaSlicer/src/slic3r/GUI/GCodeViewer.cpp Line 2768 in d6761fe std::string wiki_path = Slic3r::resources_dir() + "/wiki/filament_group_wiki_zh.html";

2. Links to local Wiki pages are broken with non'latin paths (and also it opens https instead of the local path)

3. Wiki link in the OBJ color import opens bambustudio Wiki [Fixed in Some QoL tweaks #12700]
   

   OrcaSlicer/src/slic3r/GUI/ObjColorDialog.cpp

   Lines 53 to 56 in d6761fe

   	if (is_zh) {
   	wxLaunchDefaultBrowser("https://wiki.bambulab.com/zh/software/bambu-studio/import_obj");
   	} else {
   	wxLaunchDefaultBrowser("https://wiki.bambulab.com/en/software/bambu-studio/import_obj");

4. Wiki link in the PLA/PETG warning refers to Bambu Studio Wiki (intentional?)
   

   OrcaSlicer/src/slic3r/GUI/GLCanvas3D.cpp

   Line 9698 in d6761fe

   wxGetApp().open_browser_with_warning_dialog(wxString::Format(L"https://wiki.bambulab.com/%s/filament-acc/filament/h2d-pla-and-petg-mutual-support", region));

   Demo

   2026.March.08.17.56.mp4

See the demo above at 0:30. The bug is probably there:

After adding H2D support to OrcaSlicer, the Filament Gcode legend became misaligned and unnecessarily wide. I suspect the new filament grouping section.

Demo:

	Screenshots
Others
H2D

• The new window cannot be closed using Esc (which may be pretty annoying).

• You can scroll the window content using touchpad in a weird way:

  Demo

  Scrollable.flushing.window.mp4

• The grouping window can not be closed using Esc

• The plate grouping button is invisibly active and available for all other printers after switching to them:

  Demo

  2026.March.08.21.55.mp4

Regular dual-nozzle printer profiles with configured extruder_printable_area rely on the model placement safety check. The problem here is that OrcaSlicer always assumes that the Bambu filament grouping mode is used in the printer and is set to "auto", but the grouping feature is not available for non-bambu printers. Thus, model placement is never verified (until I (ab)use another bug to change the Bambu grouping to manually set the extruder for slicing):

Solution: filament grouping dialog (both the popup and plate button) and the entire grouping logic should be disabled for all printer profiles without MMUs (including H2D) and only enabled for multi-nozzle printers with connected MMUs. The initial popup dialog also shouldn't be displayed for these profiles unless painted material count exceeds the number of nozzles.
3MF: Filament grouping + dual nozzle.zip

The speed profile menu and the main window don't update their size when moving layer slider using arrows and requires mouse movement for that

[Internal ribs] Bambu prime tower.zip (you can test this at the last layer of the tower, or just slice a sphere with arc fitting enabled)

Unable to close some notifications in preview mode without additional actions

This notification is also affected:

(probably a common issue for all stacked notifications)

You can test these notifications using this 3MF: [Internal ribs] Regular prime tower.zip

The notifications reappear after clicking to the selected plate or attempting to move a single plate (should appear only after switching between different plates)

We have the new notification for the regular supports (The Lightning base pattern is not supported by this support type; Rectilinear will be used instead.), but the Hollow pattern (shouldn't it be called "None"?) is also incompatible with regular supports and is silently replaced to Rectilinear without a notification:

	Lightning pattern	Hollow pattern (none)
Prepare
Preview

New manifestation of #6970 – the same Flow rate string is used now to describe both the Flow rate ratio calibration and the volumetric speed metrics of a line in Gcode preview:

Flow ratio	Flow rate (volumetric speed)

This leads to inability to translate it correctly into languages where the Flow part in Flow rate and Flow ratio should be replaced with different translations according to the following rate/ratio context. I think the root problem here is a term misuse, and the proper fix for that is to rename the calibration section from Flow rate to Flow ratio.

The tooltip of the zoom button has a broken width calculation

Language	Screenshot
English
Russian
Deutsch
	I don't know how it decides to break the lines, but Deutsch suffers the most

The mentioned placeholder (and probably some others) is not available for use in the new Gcode header section for no apparent reason. This limits usability of this new feature for some IDEX/dual-nozzle printers that rely on header information from their proprietary software (for example, FlashForge Creator series).

Example:

{if is_extruder_used[0]};left_extruder_temperature: {nozzle_temperature[0]}{endif}
{if is_extruder_used[1]};right_extruder_temperature: {nozzle_temperature[1]}{endif}