Smitty, if you have time, go into more detail about the procedure you are using to get from concept to part. I also am confused by what you are telling us that you are doing.
A dxf file is a drawing file, not a text file. Most cnc's run nc code in the form of a text file, but the CAM part of your Onecnc program is what produces this special machine ready form of a text file.
The file type is totally irrelevant, if all you are creating is Gcode, you could call it anything. But a text file is all it is.
A dxf file is typically an Autocad drawing file, and I have heard that there is some stuff in there that you can edit with a text editor, but it is not a general purpose gcode file.
I got my ears on, come on. Over
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)