>You can easily go through a couple hundred rounds in one visit to the range.

Range shooting is not what they're trying to legislate though.

Whoever killed that healthcare CEO didn't need a hundred rounds.

This legislation is insanely, horrendously bad and harmful, but "3D printed gun components are useless" isn't a solid argument against it. They're useful enough.

The real arguments, as others said, are:

1. You can achieve much more already without 3D printers

2. The legislation won't achieve its stated objective as any "blueprint detector" DRM will be trivial to circumvent on many levels (hardware, firmware, software)

3. Any semblance of that DRM being required will kill 3D printing as we know it (the text of the law is so broad that merely having a computer without the antigun spyware would be illegal if it means it can drive a 3D printer)