Mikey77 is well known for his tutorial on how to 3d print an electronic circuit. Now he has a new tutorial worth checking out if you are into DIY electronics. It's a method on etching and making flexible or conductive fabric electronic circuits by 3d printing a Ninjaflex flexible filament on them and etching the surplus away.
Full guide:
http://www.instructables.com/id/Make-Flexible-Circuit-Boards-Using-A-3D-Printer/?ALLSTEPS