Parkland parent opposes 3D-printed guns.

Congress needs to put the 3-D printed gun “genie” back in the bottle before the country becomes flooded by homemade, undetectable guns that could be used by terrorists and criminals, Parkland parent and gun-control advocate Fred Guttenberg said Thursday.

Guttenberg applauded a decision by Broward County libraries this week to take their 3-D printers offline until policies can be developed to deal with the potential threat, but he said Washington should make it illegal for websites to publish computer design files that show how to build the weapons.

“This administration unleashed the era of undetectable weapons,” Guttenberg said during a news conference Thursday at the Sunrise Police Department. “We need to put that genie back in the bottle before it’s too late.”

A temporary restraining order blocking the publication of 3-D printed gun blueprints is set to expire Aug. 28 unless a federal judge decides to extend it.

While people can use the blueprints to manufacture guns in their homes, industry experts say the mostly plastic pistols lack accuracy, hold only a bullet or two, must be manually reloaded and have been known to disintegrate into pieces when firing.

South Florida Democratic U.S. Reps. Debbie Wasserman Schultz and Ted Deutch joined Guttenberg, whose 14-year-old daughter, Jaime, was one of the 17 killed in the Feb. 14 massacre at Marjory Stoneman Douglas High School. Deutch and Wasserman Schultz sponsored legislation that would prohibit the publication of blueprints for 3-D guns.

Federal law already prohibits the production or ownership of a gun capable of evading a metal detector, but Wasserman Schultz said stopping the publication of blueprints would be one more “obstacle” criminals would need to overcome.