Rubber Band powered pool noodle rocket! Great for poolside fun! All you need are a couple 7in rubber bands and a pool noodle cut to 13in/330mm. This is designed to be used with TPU for the fins for maximum durability. PETG will work, but will be less impact resistant. PLA is an option, but only if this is staying in the pool or grass. The fins are designed to fit the “skinny” noodles (approx 2.2 in/55mm around). The included test part is to check the fit since the noodles can vary in size between brands. Just use the scale feature and adjust the test piece to fit your particular noodle. Don't forget to print the weight ring! It's not just for looks, it brings the CG forward so the the rocket tracks straight! It can be printed in any filament (I use PLA).