Re: Be careful for what you ask for, you might get it!
"A 5 year old boy does not need to ask his parents for a Kinder rifle before shooting his sister. Print,Bang,Done" <--- W. T. F. ! Have you not thought about the more abusive government response!
Let's say some ChemCorp comes forth with a polymer who's catalyst is something as cheap and accessible as water. Let's also say that anyone who wants a weapon that has been too inaccessible in acquisition, now has alternative means to acquire parts. Eventually, the whole "3D Printer" concept is taking to a grand new level and now the those who couldn't afford to before, now can on a mass scale. I know this is wild speculation on the future, but is it not feasible to have a synthetic future for at least Bioweapons and deployment? I think rifles and such are out, but 1 off devices such as bombs and missiles are another story.
So I have to wonder, who should I be worried about the most: A. Little Johnny that would do something as horrible as kill his sister. B. My rights to the information I may or may not put to good use. C. New found laws that support even further communist "profiling" of anyone with a printer (even if it was non-3d, I could still print out the plans)?
For the Doom & Gloom minds: Access does not equal intent! If it did, everyone has access to a gun right now, so by that rational, everyone has intent to murder. Now, for the paranoid minds :-): Eventually, these devices and their ilk will open new doors to new laws, regardless if they are needed or not.