This is a derivative of my 2 Liter bottle to 1/4 NPT adapter with giant Tom Swift style fins. The adapter is designed to let you quickly turn an ordinary house hold pop (soda) bottle into a projectile by adding water and air pressure. the 1/4 NPT quick disconnect gives you a simple and easy way to add air pressure and also works as a launch mechanism when you release the collar.In all honesty this is a bit impractical as the fins are huge and brittle and the purpose of this object is to be launched sky high and fall back uncontrolled to smash into the ground, but I had to print one up, what's life without whimsy?Please see the parent of this item for instructions, that way I can just make corrections there as I intend to make several derivatives.The "rendering" of this thing makes it look like it's just the fins, I was able to print one out without a problem, I'm wondering if my uploaded file got corrupted or it is just rendering wrong. I would appreciate it if anyone finds there is something wrong with the file they would let me know so I can fix it.