Replacing desktop 3D printers with hand-held 3D-printing pens never quite lived up to the promise of letting users turn sketches into real-life objects. And that’s partly because 3D-printing ...

A 15-year-old student at Pope John Paul II Preparatory School in Hendersonville, Tennessee, designed and 3D printed a lunch tray meant to help those with disabilities keep their lunch on their tray.