Follow the money here. Who is actually asking for this?

This law (along with similar ones in Washington & New York) is probably due to lobbying from Everytown, a gun control organization co-founded & mostly funded by billionaire Michael Bloomberg. They've sponsored summits to gather politicians & other influential people to restrict 3d printed firearms.[1]

1. https://everytownsupportfund.org/press/everytown-to-convene-...