This rocket is fully functioning and has two whistles in the nose cone that make a sound when launched. It can be made as large as desired because the middle tubes can be stack on top of each other. I have not field tested this yet so it may be unstable in flight with certain numbers of tubes.
Print solid (it needs plenty of strength). Pla might be the best because it will not warp and crack the thin walls. This rocket will work with A-C motors. the first tube fits in the fins and the last tube goes on last to accommodate the nosecone.