Inexpensive drones? 3D printers? Explosives? Not many non-military people out there that could put this together. I don’t think you could do it with an “inexpensive” drone either. Would take some large bucks and a lot of expertise to carry it off. Plus the fact you would most likely get caught. Cameras everywhere, records of purchases, etc. Not as easy as in Russia.
Portable EMP systems. Already available. No more drones.