Bottle Rocket

ccStill printing this to test.. the point fits 1.5L bottles with a flattish base.. just tape it on.. I remixed it and made it hollow from here https://www.thingiverse.com/thing:858319. You might want to add some manual supports around the stepped edge inside. my print had a little stringing but nothing major. The main cone doesn't need supports at all.
The nozzle I remixed from here https://www.thingiverse.com/thing:13898.. I had serious issues printing the original even after I modded the rear thread to be smooth.. the fins were almost separate .. anyway instead of screwing in a 1/4 NPT compressor quick release which is less likely to be available in a household unless you own a compressor this is made to use the waste schraeder valves tire centers cut out of wheels and throw away. then you can just screw on a bicycle pump.. the valve just push fits into the rear , put some water in first , but not too much.. then push in valve and pump till it flies off .. try varying the amount of