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

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-policymakers-law-enforcement-academics-private-sector-leaders-at-summit-to-tackle-dangers-of-3d-printed-firearms-amidst-increase-in-recoveries/ https://everytownsupportfund.org/press/everytown-to-convene-...