I'm pretty sure you don't even need to export anything through expert mode. Just finish your workflow as usual, then open project in explorer to find the .stl file(s). Send/copy those to whatever mill/printer you want with whatever method you prefer. If you're on Windows 10, you can open the stl files with the built-in 3D viewer to confirm it's the file you want. I've been doing it that way for months since I do not own a mill or printer yet (on standard exocad, but it's exactly the same thing).