Stomp Rocket Fins

thingiverse

In my quest to upgrade the HowToons Stomp Rocket from MAKE: Magazine Volume 42, here is a 3D model for the fins for the stomp rocket. You still use the 8 1/2" X 11" paper wrapped around a 12" section of PVC for the rocket body. The 3D printed fins should slip over the rolled paper while still on the PVC tube and should stay mostly in place on the paper when removed from the tube. I had several test flights with minimal damage to the fins. When they wear out, print another! This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/8DpX0Ykbd1P Instructions Printed at .3mm layer height, two shells, zero infill on a MakerBot Thing-O-Matic with an MK6+ extruder and Sailfish firmware. 3mm ABS MakerBot filament. The ring is 25mm in the Tinkercad file. You can adjust the file to your liking but I iterated three times and arrived at this size. My model was printed in ABS so it has different properties than one printed in PLA. Adjust the model accordingly. My model fit snugly on the PVC launch tube without being too snug. A little scotch tape wound around the bottom of the paper rocket tube insures the fin piece does not slide off the bottom of the rocket. If you are printing using MakerBot Desktop, consider using some of those "discs" included as a sample file to minimize curling of the thin fins.