The worrying thing is for me is that these printers can be used to make certain components of guns, while others can be legitimately ordered over the Internet without arousing suspicion. When put together, this could allow a person to construct a firearm in their own home.
I was in middle school the first time I figured out how to put together some 3/8" brass tube, a washer and a rubber band. (3/8" almost perfectly fits a .22 shell)
Oh, right, and duct tape. Quite a lot of concussion passes through the brass to the fingers.
I actually got fairly good with it before I got bored and tossed it out.
Should they ban brass tubing and washers?
Or RUBBER BANDS?
Oh, wait. I forgot. That wasn't me, it was my friend Ernie Lundquist.