Knowing something can be done is usually all it takes to recreate it. That a working pistol CAN be printed is all it takes for anyone with a 3D printer and the right feedstock to make another.
The Defense Distributed Liberator is a very simple design, like the original Liberator.
“The weapon was valued as much for its psychological warfare effect as its actual field performance. It was believed that if vast quantities of these weapons could be delivered into Axis-occupied territory, it would have a devastating effect on the morale of occupying troops. The plan was to drop the weapon in such great quantities that occupying forces could never capture or recover all the weapons. It was hoped that the thought of thousands of these unrecovered weapons potentially in the hands of the citizens of occupied countries would have a deleterious effect on enemy morale.”
The modern Liberator has the exact same purpose. The US Government couldn’t have done a better job of both popularizing the Liberator or demonstrating the reason for its existence.
You can’t stop the signal.