This is the Planet Launcher!

Feel free to print this free of any supports and screws. The only thing needed is a spring, everything else snaps together and then all you need to do is pull the tab and watch your rocket take off! The stronger the spring you use, the further the rocket will fly. Please do not point at any animals, people, children, computer screens, or windows.

The spring I used can be found here: https://www.homedepot.com/p/Everbilt-Spring-Assortment-Kit-84-Pack-13554/203133714

I used the spring with dimensions: 30.3mm x 9.5mm

To see the order of assembly, please refer to the blow up picture next to the thumbnail.