The bottom of that wiki page has links to EFF pages. However you are correct that they view it as a lost battle:

  (Added 2015) Some of the documents that we previously received through FOIA suggested that all major manufacturers of color laser printers entered a secret agreement with governments to ensure that the output of those printers is forensically traceable. Although we still don't know if this is correct, or how subsequent generations of forensic tracking technologies might work, it is probably safest to assume that all modern color laser printers do include some form of tracking information that associates documents with the printer's serial number. (If any manufacturer wishes to go on record with a statement to the contrary, we'll be happy to publish that here.)

  (Added 2017) REMINDER: IT APPEARS LIKELY THAT ALL RECENT COMMERCIAL COLOR LASER PRINTERS PRINT SOME KIND OF FORENSIC TRACKING CODES, NOT NECESSARILY USING YELLOW DOTS. THIS IS TRUE WHETHER OR NOT THOSE CODES ARE VISIBLE TO THE EYE AND WHETHER OR NOT THE PRINTER MODELS ARE LISTED HERE. THIS ALSO INCLUDES THE PRINTERS THAT ARE LISTED HERE AS NOT PRODUCING YELLOW DOTS.

  This list is no longer being updated.

I wrote that text when I worked for EFF!

Anyway, two things about this:

* EFF definitely did not think that the regular printer tracking dots mechanism was appropriate.

* You could probably argue this either as a modus ponens or a modus tollens -- that is, in either direction -- but one criticism that we made of the tracking dots was that they were (mostly) secret voluntary cooperation between industry and government, not an actual law. Perhaps an actual law is preferable because the public can understand in detail how it's being restricted, as well as oppose it politically and potentially challenge it in the courts.

Of course, the current 3D printing restrictions are proposed as an actual law. That does seem largely better to me than "we got most 3D printer companies to put some secret software in their printers to enforce some unspecified policies that the government asked them to, and the companies and the government don't want to talk about it", although one way it's better is simply the opportunity to oppose it in the legislature.