Other countries are less fortunate. It is my hope that instead of building higher walls--in the literal sense, or in the form of checkpoints--we can take a closer look at what drives the gun violence. Inequality seems to be a big factor. Access to psychiatric treatment might be another.
It saddens me that the easiest solution might be to simply ban 3d-printers. This would get someone a cheap political win, not actually solve the problem, and ruin something great for everyone else.