Universal adapter for Soda bottle and Gardena coupling and rocket fins

thingiverse

This is an adapter to attach fins to a 0.5 - 2 liter soda bottle, as well as to install a Gardena ¾" faucet coupler. You need to put a rubber gasket between the bottle and adapter. Gardena offers such a gasket in their product line, but the Gardena part itself already comes with a rubber gasket and O-ring. To create a launcher based on the Gardena coupler, visit https://www.thingiverse.com/thing:4368014. Print the coupler with 4 layer walls and 100% infill to make it air tight. A bit of silicone grease will also help. See the post-printing instructions for further guidance. I have uploaded two types of fins. Choose the larger one for larger bottles. Print the fins horizontally for maximum strength. While you can try printing the entire device at once, this will result in less strength and may cause the fins to break during a rough landing due to horizontal layers. When applying pressure, be cautious and keep your distance. The bottle might explode if subjected to too much force. I have personally limited my pressure to 40 PSI.