Homebrew PCBs

Henry Liu wrote:
> Has anyone tried attaching a very fine pen to a cnc then etch the pcb
> board? Right now I'm using pcb-gcode but it's a pain because it takes
> so long to remove all the material when 95% of the board is empty
> space and 5% traces. Also until I get my vacuum holder, it is hard to
> be quick with the setup. I'm thinking a pen mounted in the holder
> will be able to write the traces better perhaps then I can chemically
> etch them. Has anyone tried this? Thanks.
> Henry

Can you use the CNC to remove the 'border' of the tracks instead of the 
majority of the copper?  We achieve this by making the majority of the 
board a ground plane and expanding the power/ground lines to fill gaps.

Stuart