Have all the regulation you want. Anything short of full North Korea levels of suppression will fail.
You're coming to a paradigm shift. Your social model won't survive it.
Think of the social models that existed before agriculture.
Think of the social models that existed immediately after agriculture.
Think of the social models that existed prior to the industrial revolution.
Think of the social models that existed immediately after the industrial revolution.
You have come upon a paradigm shift. I can guess what it will do but its too complicated for me to really reason it all out in detail.
What I do know is that that status quo won't survive. It never does. Things change.
If we all own Omni Tools... anything makers... things that can make explosives, drugs, automatic weapons... you can't stop it.
The reality is that you won't even be able to recognize half of the stuff. Your system is based on regulating stake holding commercial interests. These are economic choke points. But in the new paradigm those won't exist or will be much much less prominent. And who is to say that I have to make my contraband look like anything you'd recognize? if I've got a micro factory that can make custom anything for me... then I can put a gun in an ipad. Imagine the most absurd cold war nonsense. There's no reason the average citizen couldn't be printing out that weapon. What are you going to do? X Ray everything? And even if you do... who is to say that the internal workings of the thing couldn't be made to look harmless or simply not suspicious.
And then you might say "well I could look for certain chemical residues"... sure... but who says I even need to use chemical propellents? A good deal of the cold war assassination weapons were air rifles. Quieter. And then what are you looking for... CO2?
The CIA during the Cold War had an assassination pistol that fired a 3 MM ice bullet that contained a drop of shell fish derived neuro toxin. You could shoot someone with this this thing a crowded room. No one would even hear the shot go off. The toxin causes anyone hit with it to have a fatal heart attack. The body could be examined and the wound would look like scab or a pin prick. The bullet melted into water. The neuro toxin breaks down almost immediately. It is a functionally undetectable assassination weapon that the US has had in its inventory since at least the 1960s.
You're thinking in industrial terms. You're thinking about how you'll regulate blue collar people in the industrial era. That's not the context.
What you're talking about is akin to banning marijuana. Its a plant. Any idiot can grow it in some soil. Its illegal throughout most of the first world and its impossible to control throughout the first world.
Now imagine instead of some drug that a teenager can grow in some soil... you're dealing with microwave sized factories that can produce... just about anything.
Your regulation paradigm won't survive that.
What is my solution? Regulate people... not technology. Its a radical change in policy but the alternative is anarchy. The old paradigm is non-functional in this setting. Totally pointless waste of time.
Regulating people... knowing who is who and where they are and what they're like... Data mining and profiling... using expert systems to estimate the chances of X person doing Y crime.
Short of that ... you're going to be subjected to constant terrorist attacks, mass shootings, drug outbreaks, bombings... whatever. And the tools used to do all that stuff are just going to get better. Better electronics, better sensors... we are already seeing drones being used in crimes... mostly smuggling as of now but there's no reason a drone couldn't buzz a stadium and disperse anthrax or something over 30,000 people.
Its coming. Its not a matter of if but when.