Fix line in Project.py which prevented the saving of .stl models

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@982 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/Gui/Project.py

@@ -2530,8 +2530,7 @@ class ProjectGui:
             return
         try:
             file_in = open(filename, "w")
-            model.export(comment=self.get_meta_data(),
-                    unit=self.settings.get("unit")).write(file_in)
+            model.export(comment=self.get_meta_data()).write(file_in)
             file_in.close()
         except IOError, err_msg:
             log.error("Failed to save model file: %s" % err_msg)