Aubs

Is it possible you're importing 3MF files? - I wondered about this and found this post which answers the question: I've also noted a possible related issue and raised it below, I've linked a screencast of what I noticed:

Hello, Not sure if this is a bug, but it looks like Cura doesn't know where to put an STL file when it is opened while a 3MF file is already loaded. <iframe width="640" height="650" src="https://screencast.autodesk.com/Embed/Timeline/186cc8e3-b4ec-47dd-8752-9f975bef6fea" frameborder="0" allowfullscreen webkitallowfullscreen></iframe> If the above iframe doesn't work (I don't expect it will and there's no option to embed any videos), the following link is to a screencast of the potential bug: https://knowledge.autodesk.com/community/screencast/186cc8e3-b4ec-47dd-8752-9f975bef6fea The first part of the screencast refers to the post linked below - opening a 3MF file places it at the origin contained within the 3MF from the exporting application; STL doesn't contain origin information. The second part of the screencast from 1:30 demonstrates what could be considered a bug: When exporting a 3MF file from Fusion 360 and opening in Cura, Cura defaults to place the object at the same origin it was in Fusion 360, i.e. it takes the origin from the 3MF. Exporting an STL file and opening in Cura always (normally) goes to the centre of the build plate. When the STL file is already at the centre of the build plate (this isn't 0,0 because that is in the bottom left corner, but it is 0,0,0 in Cura world), opening the 3MF places it correctly at the origin, which is 0,0 (Cura world -110.0011,110,0). But, when the 3MF is loaded first, the STL file is placed outside the build plate, on the right hand side, at 200,0,0 in Cura world.

Thanks for this, changing it to 0,0 wasn't that much effort, but Ctrl+R is much easier. It would be good if there was an option to Ctrl+R (Arrange all models) by default when importing 3MF files and ignore its own origin.

Thanks @nallath for your advice, I now understand what it's doing and the rationale behind it. As much as I've got to like Cura's simplicity and ease of use (even in Expert mode which I am certainly not!), it's a shame it doesn't have similar capability as to what PrusaSlicer appears to do, that is, see both components (it calls them parts) in the single STL and when combined, slices them both as one.

I don't normally ask questions on boards, because most of the answers are already out there, or I figure it out myself. This one has stumped me. I like Cura and don't want to change. I have already asked about this on the Fusion 360 board (https://forums.autodesk.com >> multiple-components-to-stl-have-shell-walls-between-components), the response was: For completeness, I've included the information from that post: I've been struggling to work out how to export multiple components to STL, and I hope someone can help me. I've searched extensively online and the only results come up with how to export multiple components, but none appear to relate to the inner shell walls. If I turn on only the components I want, then export Save As STL from the FileName at the top of the browser, import to Cura, I get the first image, which has inner shell walls between each component. As you can see, there is an overlap of the wall which creates a bulge in the printed piece. [Plus the inner/outer walls between the two components] If I merge the components to a single new component and Save As STL, it all looks as one piece with the infill correcly flowing between components and only a single outer wall where there should be one. Any assistance to point me in the right direction would be appreciated. I know there are several similar posts, but neither Union Overlapping Volumes nor Remove Mesh Intersection resolve it, I've also tried Binary and ASCII exports from Fusion 360 and same. If I export a new STL from Cura (Binary or ASCII) and open that (as per the old thread above), it is still the same. Attached Images of the uncombined and combined Binary STL of the uncombined and combined from Fusion 360 3MF export from Cura 4.9.0, Binary STL exported from Cura 4.9.0 Configuration Windows 10 (19041) Fusion 360, Personal 2.0.9937 Ultimaker Cura Version 4.8.0 [Tested today on 4.9.0, only difference is white 'Starts'] TestOverlap v1(uncombined).stl TestOverlap v1(combined).stl CE3_TestOverlap v1(uncombined).3mf CE3_TestOverlap v1(uncombined).stl