Nerf Rockets. They can be fun, but the fins get ripped off very easily, and causes the foam dart to be impossible to aim. So, I created a replacement part! Based on print settings, it can take about 20 minutes to 1 hour to print. There is a side that says “glue here.” That is where you will use hot glue, superglue, etc to glue the fin back on to the rocket with the shortest side of the fin pointed down. 

Just be careful, there is now plastic on your nerf rocket, which may hurt more if hit by it. Maybe TPU will help with that, I have not tried it.