Thing is, this law will do nothing about making 3D-printed guns less accessible to be used for criminal purposes. It's still trivial to go and download the schematics and feed them into the printer. Sure, you'd be committing a crime merely by doing so now, but if you're 3D-printing it specifically to go and shoot one, I don't think that you actually care.
In any case, home-made AKs are probably not a good baseline. They still require a reasonably well stocked workbench, and some machinery for things like the barrel. But a single-shot shotgun can literally be made out of two pieces of pipe and a screw, all readily available in any hardware store - and is still more deadly than any of these 3D-printed plastic toys (and for bonus points, no-one is likely to recognize it as a shotgun, especially when it's disassembled).