A fun toy for kids that can also be used to demonstrate the fundamental difference between gas and liquid under pressure.

About 5h print time for one unit.

1. Mount the ground stake for use in the lawn, or screw the launcher onto a wooden board.

2. Secure the bottle using the included release mechanism.

3. Connect hose, turn on the water and wait for the pressure to stabilize.

4. Launch the bottle by pulling the release cord from a safe distance.

TIP: You can also decorate the bottle rocket - models available on MakerWorld.

All parts are 3D printed. Fits standard 0.5 L and 1.5 L soda bottles. A few wraps of electrical tape can be used to seal against the bottle neck if you do not have TPU for printing the O-ring. Alternatively, a standard O-ring can be purchased from a hardware store: outside diameter 21mm, thickness 2mm.

Available with threads for standard garden hose connectors:

• G 3/4"
• G 1/2"

Both versions are included in the .3mf file.

Note: This model is designed for use with normal household water pressure only. Any modifications are made at your own risk.