I don't think this reprap is mechanically rigid enough to mill. I don't know about other versions of reprap.@Qsilverrdc
Richard, EXCELLENT! Very cool.
Your boards are looking good. Drilling a zillion holes has always been a pain. Very nice solution.
Have you thought about milling the PCBs with your Reprap?
Also have you thought about mounting a pin point UV light source in the Reprap and use it to expose your boards? This is something I have been working on for a while using a pin plotter.
As far as direct exposure, it could work. I think it would take a long time to print or expose a board.
If you were to convert the traces image to a stl file, then you could use reprap standard software to generate the tool path.
What pin point UV source would you use?