South African father-and-son engineering duo just 3D printed their way into the record books: their Peregreen V4 quadcopter, largely 3D printed on a Bambu Lab H2D, zoomed to a verified 657 km/h (408 mph) to reclaim the Guinness World Record for the fastest battery-powered remote-controlled quadcopter drone, edging past rivals and proving that high-speed UAV innovation isn’t just for aerospace labs anymore.