No one is going to print a gun that gets past the screeners (unless they are jacking their jaws with their co-workers or playing on their cellphones while they are supposed to be working and they miss it just like they miss real firearms).

It doesn't matter what the materials are: a 2-inch plastic toy gun, a sock monkey's tiny gun or a plastic replica (one side only) on a woman's purse were confiscated. You can't even take a kid's squirt gun through the checkpoint, and it would almost certainly get confiscated from a checked bag.

It's going to be interesting to see if the printers themselves are allowed through the checkpoint.