Currently, make 2D, if “maintain source layers” is ticket, copies all layers into a new parent, “Make2D”.
Is there a way to keep each object into its original layer? This way, when I turn off a layer, it will turn off both in the Make2D and in the original drawing.
I don’t think this is possible as an option out of the box, but a script can solve it. Save the attached .py file (moveMake2DLayers.py) someplace, and then in Rhino run: -RunPythonScript "C:/PATH_TO_YOUR_FILE/moveMake2DLayers.py"
You can even set up an alias for it (like FIX2D or something) so that you can quickly set the layers where you want them with one command after doing a make2d.