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In case it matters, I'm running 2025.06.25 of OpenSCAD. If I have an instance of OpenSCAD running I can open additional source files such as libraries in the same instance using the menu system. Such sources appear as tabs on the main window.

Is there any way to get this behavior from the command line?

Why? I use Emacs for editing and scad-mode maps C-c C-o to open the current file in OpenSCAD. If I open another scad file and hit C-c C-o it starts a new instance. In fact, it will start multiple instances on the same file. This can create both confusion and data loss if one happens to update the .json file from different instances. I'd like to update the mode, if possible, to include this ability but I'm not spotting the correct parameters (if they exist).

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    The ability to do this was requested a few years back on the OpenSCAD issue tracker (github.com/openscad/openscad/issues/3675), and received no interest at all. I think the best you're going to do with an external editor is to manually open the file in OpenSCAD once, then use Design -> Automatic Reload and Preview to update the rendering when you save the file in your editor. Commented Jul 1 at 20:18
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