FreeCAD to EstlCAM to EstlCAM controller workflow

I am Using Estlcam, and have been able to get STL files 3d milled. That is horribly inneficient however. I prefer to machine faces of my work in 2d milling (4x faster, more logical patterns), yet I cannot seem to get Freecad to make DXF.

Freecad is rather new to me, I am an Inventor-Autodesk operator at work, anyhow. What workflow has anyone created to accomplish this?