Basic nose cone for Estes model rocket. Prints flat on the bed, no supports. Shock cord mount molded inside the nose cone.
It will print hollow with 0% infill and at least 2 perimeter loops.
I sized this one for a paper towel tube. (Approx BT-55 size.) You may need to adjust sizing on your printer for the tube you're using. Can be scaled for other size tubes.