If OpenSCAD or FreeCAD is set up to use pipes for communication, assume it's because one or the other is sandboxed. In that case, OpenSCAD will not be able to import the generated STL file from FreeCAD, so don't try to run that test.
If OpenSCAD or FreeCAD is set up to use pipes for communication, assume it's because one or the other is sandboxed. In that case, OpenSCAD will not be able to import the generated STL file from FreeCAD, so don't try to run that test.