Making water rocketry universally accessible through 3D printing

Snap-fit assembly. No adhesives. Portable. Worldwide compatibility. Free forever.

Enabling STEM education through water rocketry

Water rocketry has inspired generations of scientists and engineers. A bike pump, launcher, and a little ingenuity can launch soda bottle rockets hundreds of feet in the air.

The Marimo Labs Launcher brings water rocketry to a new generation: it is the first globally-compatible, full-bore launcher built from 3D-printed parts and readily-available off-the shelf components. No glue, pipe, or adhesives are required.

Refined over three years of research and development.

Free forever under a Creative Commons license.

The most popular and best-reviewed 3D printed water rocket launcher

To this day this is my favorite print. … Kids and adults alike love watching it shoot off. I did a Egg launch with 12-14 year old boys. they designed their own safety mechanisms to help land the egg in one piece. I can tell you it was a blast literally. the boy were just as excited to see the egg smashed and they were seeing it safe. … If you are on the fence about printing this one I assure you it is amazing.

3DPrintingForSilv, MakerWorld

My favorite 3D print to date. I can tell a ton of work went into this and it paid off. Thank you to all involved.

Ryan Moore, Printables

Getting ready to do a project for my AP Physics Students, and found the perfect Resource! Everything printed out like a dream, and I am so excited to show it off to my kids.

Carl B, Printables

A product of global collaboration

USA. UK. Germany. Slovakia. Luxembourg. Italy. Denmark.

Enabled by the worldwide 3D printing community, the Marimo Labs Launcher design has been refined by dozens of individual collaborations to maximize global compatibility with all narrow-neck soda/seltzer bottles in modern production.

In its simplest version, the design is snap-fit and needs only five non-printed parts.

Design Notes

Deep dives into the design of the Marimo Labs Launcher. System theory, additive manufacturing, subassemblies, and safety considerations.

Model Downloads

Printables

All 3D models, free to download without registration. Includes parts lists, latest updates, and Makes from around the world.

MakerWorld

Limited model cross-post available at MakerWorld. Featured Model.

Purchase Launcher Kit

To make the launcher accessible without a 3D printer, kits are available for purchase from Macy Makes 3D, a 3D-printing small business based in North Carolina, USA.

Currently shipping within the US and Canada.

Please read disclaimer in section below.

Safety and Liability Disclaimer

This launcher design will always remain experimental and is not a toy.

Pressurized systems are inherently dangerous.

Adult supervision is always required.

Any kits are made available for convenience and are not warranted for suitability for a particular purpose. Design or manufacturing defects may exist. A responsible supervising adult must make a determination of whether your particular combination of printed and non-printed parts, ground anchoring systems, bottles, hoses, pressurizing systems, personal protective equipment, protocols, users, and environment are safe for your application. 

The launcher must be firmly anchored to the ground for use. Never point at anyone or anything. No one should ever have any body parts above a pressurized bottle, as the bottle may disengage unexpectedly at any time and cause injury. Heat may cause deformation of parts and all parts should be inspected before every use.

Your use of these models or information or kits indicates your agreement to accept full responsibility and liability for use and hold harmless Marimo Laboratories LLC and its employees and affiliates for injury, death, property damage, loss of income or function or any other damages associated with the use of models or information. No warranty or guarantees are made regarding the safety, performance, or completeness of any designs, models, instructions, or analyses presented.