Homebrew PCBs

I'd try Rapidograph pens

http://www.dickblick.com/zz210/03/

If I remember right they are basically a hollow tube with a wire in them.  The wire actuates a  valve, thus you would have to be able to lift the pen to stop the ink.  Extremely light touch and very fine lines.
 
	 
	
	








	


	
	


      

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