There's already large amount of restrictions, I'd imagine that this list will only become bigger and people will be controlled even more.
Regarding 3d printing maybe the govt. will monitor whats being printed by limiting 3d printers themselves. Does that also mean restrictions on regular CNC stuff? At this point, I don't know. Many governments do everything they can to push people back into the stone age regarding armament. Unitary cartridges are being banned, same goes for crossbows and swords (especially in the Unoited Kangdom).
Although there will always be someone who will make something that goes "boom" without any schmancy fancy equipment, despite any laws that say "pls dont do that".