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"Students are already seeing 3D-printed guns and gun parts show up in our schools and communities, so we know this threat isn't hypothetical," said Justus Weatherspoon, a student leader with UC Davis Students Demand Action. "California is leading by acting before this technology becomes another easy way for people to make illegal guns. Young people deserve leaders who look ahead at emerging threats to our safety, and today California showed the rest of the country how that's done."

3D-printed firearms are the next wave of the ghost gun crisis. As 3D printers become cheaper, more capable and more accessible, people who cannot legally purchase firearms can increasingly circumvent California's gun safety laws by manufacturing untraceable guns and gun parts at home. Earlier this year, New York became the first state in the nation to pass legislation establishing safety standards for 3D printers to prevent the printing of illegal guns and gun parts.