simpler solution would be to add lots of noise by printing your own wellow dots in every printed page best solution is openhardware and software, but printers are subsidezed by the ink cartridges, so it would cost a lot more than commercial ones.

That is literally how Richard Stallman got into open source software. http://en.wikipedia.org/wiki/Richard_Stallman#Events_leading...

Well, at least one can modify a rep-rap style 3d printer into a poor man's plotter... But it won't really do for printing a 600 page manifesto to send to newspapers in preparation for a grand terrorist attack...