Why else would you have a 3D printer than to launch things high into the sky!?

This project is great for school projects, or just for fun! It will test your printer's bridging capabilities, ability to use supports, and if so desired, the ability to print with different filaments.

Instructions-

This Water bottle rocket is designed around a 1 liter bottle, but can be modified for a 2 liter. This project includes the launch assembly as well:

• Locking mechanism to prevent early launch
• Trigger mechanism to ensure a launch
• Launch pad.. self explanatory

Items needed for assembly:

• Components above
• 1 Liter Bottle
• 8" x 8" X 1" Wood - cut legs to height desired
• Drill
• 1" to 1 1/2" Hole cutter
• #8 3/4" wood screws
• Hot glue gun

Launch Platform: 

I used a spare piece of 1in thick pine to mount the launch plate to. After drilling out a 1" hole (2.5cm for the folks across the pond) center the launch pad and screw into place. 

Rocket:

First, dry fit the nozzle into your bottle. The nozzle has 2 channels set into the end that goes into the bottle. Utilize these channels to put a bead of hot glue into. Then place the nozzle into the mouth of your bottle, and plumb the nozzle before the glue sets. Measure the circumference of the bottle near the tapered end (largest cross section) at the mouth of the bottle, divide by 3, and mark the bottle accordingly. Test fit the fins to the bottle and adjust as necessary (not universal, so sand as needed). Lay a bead of hot glue on the curved edge of the fins and set them in place, plumb, and hold until set. Dry fit the nose cone, and glue in place. As mention's this is modeled after a 1 liter bottle, but you can scale the fins, and nose cone to fit a 2 liter.