There has nothing changed, we focus on 2D and there are no plans to add 3D features. Also there haven't been more request since then iirc, nor are there developers indicating interest working on it.
To be honest, I don't see how we should track modifications in 3D format files from LibreCAD's point of view. How should we evaluate which modifications are related to our 2D DXF drawing?
I think when 3D software has capabilities to modify 2D drawings from DXF import, this software should also be capable to export the modified 2D view.
Or one has to be strict in modifying 2D and 3D files. I do so with OpenSCAD, where 2D DXF files are only linked by name. I modify the DXF file with LibreCAD and then refresh the OpenSCAD 3D model to apply the changes. In OpenSCAD modification of DXF files is not possible and DXF export is very simple.
I think latest FreeCAD has a 2D Sketch workbench, but I don't know about it's export capabilies.
Armin
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