Project G (Knex Ball Machine) By jawlecks in LivingLEGO & K'NEX2,326133Save PDFFavoriteIntroduction: Project G (Knex Ball Machine)By jawlecksFollow More by the author: About: . More About jawlecks » This is a ball machine that I made through a period of like a week. Didn't really spend that much time on it. It's not very dense at all because I don't have many pieces.