We recently got the StratoLauncher Water rocket, they are pretty awesome.. if you have not seen them. Shoots 2 liter bottle 400ft in the air.. which means the spines and connectors are bound to get caught in the wind and lost in someones back yard (even shooting in a large park) this is my first attempt of recreating it. I'm sure PLA will work fine, they wear out after a while anyways, I primarily print ABS.