Plastic Bottle Rocket Fin Support

thingiverse

This is a simple support used to hold thin cardboard or plastic fins on the lid end of a plastic soda bottle. It's designed so that the bottle lid holds this part firmly in place, allowing you to easily move it from one bottle to another and drill the lid to your preferred nozzle size. The fins can be secured with small pieces of filament pushed through cardboard or tiny nails driven into thin plastic, making it ideal for testing different fin designs.