If someone put a gun factory in their backyard and starting distributing guns, he has to be found liable. Why should that be different for a plastic gun? My co

If someone put a gun factory in their backyard and starting distributing guns, he has to be found liable. Why should that be different for a plastic gun? My concern is that a printed gun is disposable and untraceable. Without ballistics, its certainly a tempting option. Also going through metal detectors is a huge deal over security measures. It looks like a game changer to me.