By issuing a takedown notice to the maintainer of the blueprint, it's very unlikely that they're going to stop the flow of information. Additionally, it turns out it's probably not effective to stop them from distributing the blueprints now that they're already on the internet.
We're probably not going to see a massive number of these come into existence because the printers aren't exactly a commodity yet. I imagine the people who own these printers, and the printing services will notice what's being printed, and that's probably the best place to control these.
"The idea of the darknet is based upon three assumptions:
1) Any widely distributed object will be available to a fraction of users in a form that permits copying.
2) Users will copy objects if it is possible and interesting to do so.
3) Users are connected by high-bandwidth channels.
The darknet is the distribution network that emerges from the injection of objects according to assumption 1 and the distribution of those objects according to assumptions 2 and 3."
I doubt the general effectiveness of the Streisand effect, since it seems like exactly the kind of thing that would be subject to selection bias: the examples of people trying to stop the spread of information that you know of are of course mainly those where it failed. That you can name many more examples of it failing doesn't mean that there aren't lots of examples of it working that you have no way of knowing about.
By issuing a takedown notice to the maintainer of the blueprint, it's very unlikely that they're going to stop the flow of information. Additionally, it turns out it's probably not effective to stop them from distributing the blueprints now that they're already on the internet.
We're probably not going to see a massive number of these come into existence because the printers aren't exactly a commodity yet. I imagine the people who own these printers, and the printing services will notice what's being printed, and that's probably the best place to control these.