These are model rocket components printed in PLA. I had a thin wall PVC pipe with a 1 5/8 OD approximately 17 inches long and decided to make a model rocket out of it. The pipe wall is 1/16 inch thick and 170 grams.

I designed 4 whistles into the nosecone, hoping it will scream on takeoff. Guides on the fins and shroud are sized for a 3/16 or 1/4 inch guide rod. The assembled rocket will probably need an E or F engine.