"Add Part" not properly aligned to parent object

[toddanglin]

There appears to be a regression bug in the latest Bambu Studio (v 1.4.0.18, macOS 12.6) that causes parts added to an object to be improperly positioned. (I have also validated that this behavior/bug still exists in v 1.4.1.52 beta build.)

Expected Behavior (and Bambu Studio behavior pre-v1.4.x)

1. Import a 3MF object in Bambu Studio
2. Right-click object, choose "Add part..."
3. Choose a different 3MF object file that represents a different part of the design
4. New part object is added in correct relative position to the parent object

Actual behavior (in v 1.4.0.18)

1. Import 3MF object in Bambu Studio
2. Right-click object, "Add part..."
3. Choose a part object
4. New part pbject is positioned directly on the print plate surface, not in the correct relative position to the base object

It seems the local/relative coordinate system of the objects is being ignored. This works properly, as expected in Bambu Studio v 1.03.01.01 (last stable release before 1.4.x).

[toddanglin]

Extra context:

• I'm working with multi-part objects exported from Fusion 360 as multiple, separate 3MF files
• I load the "base" 3MF file, and then attempt to add the "children" parts from separate 3MF files
• In the past, this would correctly position the parts relative to the "base"

Work around:

• If you export all parts from Fusion360 as a single, multi-part 3MF file and load that in Bambu Studio, the parts will be correctly positioned

[SaltWei]

@zhimin-zeng-bambulab Please help to comfirm whether the behaviour is as expect

[MadMax389]

Not working for me as well in v1.4 in a complex project with a lot of parts. It was working in v1.3.

[zhimin-zeng-bambulab]

I try to reproduce this problem, but it doesn't seem to work. The picture below is what I did.
I found that the newly added object is always in the lower right corner of the original object.

[zhimin-zeng-bambulab]

@toddanglin Could you provide your 3mf file, and the sub-part obejct file? It will help us to solve the problem, thanks!

[toddanglin]

AddPartEx-3mf.zip
The attached zip contains two 3MF files that demonstrate the problem:

1. Add the "AddPartEx-Base-Square.3mf" to a new Bambu Studio project
2. Right click "Add Part" and choose the "AddPartEx-Part-Circle.3mf"

These objects are positioned like this, in a nested layout in Fusion360, and then exported as separate 3MF files:

In Bambu Studio pre-1.4 (and in other slicers), the Circle should be loaded in the correct position embedded in the Square (see first image). In the current version of Studio, the Circle is instead incorrectly loaded at the corner of the base Square object (see second image).

Expected:

Actual:

Again, it appears that as of 1.4.x, Studio is ignoring the local/relative origins of the saved models, causing them to be positioned to the global origin of the build plate. Let me know if you have any trouble reproducing with these example files.

[zhimin-zeng-bambulab]

Thanks a lot，we will fix it in future version.

[SaltWei]

FIx is available in v1.5.0 Public Beta

[Bathsheba]

This is not fixed. Added parts, and parts imported at the same time, all drop to the build bed. They are not correctly positioned relative to each other.

[SaltWei]

This is not fixed. Added parts, and parts imported at the same time, all drop to the build bed. They are not correctly positioned relative to each other.

@zhimin-zeng-bambulab Please check and respond

[zhimin-zeng-bambulab]

@Bathsheba Could you share your 3mf file? And could you use a picture to show your problem？

[MadMax389]

I can confirm this behavior (v1.8.4.51). Image on the right, both stls loaded on the plate at the same time and assembled as one object. Image on the left, loaded car body first, then loaded window as a part...

[Bathsheba]

@Bathsheba Could you share your 3mf file? And could you use a picture to show your problem？

Sorry I didn't keep the file, it occurred in the context of trying to print a part in one filament completely enclosed by another part in another (translucent) filament.
I was trying to create a part with a negative area floating inside it, and a second part occupying that area. I was not able to do this. Thanks for your consideration.

[zhimin-zeng-bambulab]

@MadMax389 Could you share your stl files to help us solve this problem?

[MadMax389]

I created a new example.
This is a Fusion 360 drawing of two stacked cubes. Each body was exported separately. Cube stls are attached in zip file.

In this image on the left plate, both cube stls were added to the plate together and assembled as one object. On the right plate, the lower cube was added first and the upper cube was added as a part.

Prusa Slicer handles this operation properly,

Cubes.zip

[zhimin-zeng-bambulab]

it has been fixed in v01.09.00.06