I don't think these really are the scare monger pieces you're trying to frame them as. Both articles are very much so about some idiot teenagers printing and bringing 3d printed weapons to school. Police would have seized any tools the kids had been using to produce these items because thats how evidence collection works. Even your story from last month hinges around the items being found in a school.

Don't get me wrong there are legitimate threats to 3d printing as a technology with proposed legistation in some US states aimed at curtailing 3d printed "ghost guns". That fundamentally misunderstand the technology and instead are attempting to enforce a censorship mechanic that is entirely unfeasible. But these articles just arent an outcrop of the same kind of thing, IMO