Water Rocket Launcher by Marimo Labs

Marimo Labs

Education>Engineering

Print Profile(1)

All

X1 Carbon

P1S

P1P

X1E

Profile base on designer Specs (Amazing!)

10.6 h

2 plates

4.9(19)

Boost

329

597

371

228

Released

Description

Universal Water Rocket Launcher v1.42 - 13 May 2024

A full-bore water rocket launcher system designed for easy assembly and universal compatibility.

May 2024 update: 1800 downloads between Printables and MakerWorld as we're entering a northern hemisphere summer launch season. Thank you to everyone who has tried the launcher and provided feedback. Please continue to post your Makes as It's a lengthy print that takes commitment. It's good for people to know that it's worked for others.

I've been asked for printed and non-printed parts kits to help with accessibility and convenience. If enough people think this would be (or would have been) helpful, I'll organize this. Please let me know by emailing launcher@marimolabs.com.

Video instructions above.
Written instructions on Instructables: https://www.instructables.com/Simple-3D-Printed-Water-Rocket-Launcher/
Detailed design discussions at: https://www.marimolabs.com/water-rocket-launcher
Read the Safety Instructions PDF!
Additional model files (for advanced variations, fins, payloads, etc) are at the main model page at Printables: https://www.printables.com/model/86434-water-rocket-launcher

Disclaimer

Hey. Pressurized systems are dangerous. Know what you are doing and take appropriate safety precautions. Make your own assessment about whether this project is appropriate for what you are trying to do, and use at your own risk. Do not attempt without appropriate experience, protective equipment, and tools. Most water rocket guides recommend not pressurizing past 60psi/4 bar. Always secure the launcher to the ground.

PARTS LIST

Non-Printed

TR414 Tire valve stem
O-ring 15mm ID x 3.5mm thickness x 22mm OD
Schrader (car/mountain bike) valve hose extension
Rubber bands, any, but silicone #33 (3 1/2" x 1/8") are nice
String to tie to Launch Pin
Reusable straw, 7.6-8mm OD (prevents water backflow into pump)

Printed

Base
Collar
Clamp x6
Core Type B
Launch Pin
Leg x3
Peg x3 (don't skip securing the launcher to the ground!)
Carrier

PRINT SETTINGS

Launcher Parts

Line width: 0.4-0.45mm
Layer height: 0.20mm
Walls/perimeters: 2-3
Infill: 20%
Filament: PETG ideal (for temperature stability) but not required. PLA/PLA+ is fine, but you must protect from heat to prevent deformation.
Supports: None
Brims: Core B and the Launch Pin have small footprints and may benefit from brims if your bed has low adhesion. Generally not needed.

Printing tips

Consider slowing down print speeds and accelerations, especially if using PETG. I suggest cutting in half. This allows better layer adhesion, bridges, and text quality. CoreXY is so blazing fast that PETG sometimes isn't able to stick to itself.

Documentation (1)

Other Files (1)

Water Rocket Launcher Safety Instructions 2024-05_049601b9-7f76-49c2-87cb-8c7d7aae116a.pdf

Comment & Rating (39)

@Morgus

Boosted

Print Profile

Profile base on designer Specs (Amazing!)

Update to review, while the briding wasn't great on this print. I think this is an issue with Bambu PETG filament. Reprinted with generic PETG profile and a different brand PETG didn't have any issues. Bambu is currently in process of retiring their PETG basic line of filament and may be doing a reformulation. I suggest using another brand PETG filament for this project currently. Bambu PETG in gray, Elegoo in white with generic PETG profile.

(Edited)

@marimo

Thanks for the feedback. Folks are having trouble with the high-speed defaults in Studio. I agree that we need updated print profiles for PETG. I don't have a P1P/S or X1C myself so I'm unable to build out a new profile on my own. In the meantime, I'd advise cutting default speeds and accelerations in half for PETG, which doesn't stick to itself as well as PLA.

@Morgus

Boosted

Replying to @marimo :

Thanks, I will try it and upload a print profile if it works better. I boosted the model because this thing is fantastic, just need to work some kinks out of the profile.

@Morgus

Boosted

Replying to @marimo :

Something else I just learned today is the Bambu PETG is getting discontinued. Apparently has a lot of quality issues. I’m going to reprint in another brand with the generic profile and see if I get the same bridging issues because I printed the second plate in Elegoo PETG at full speed with absolutely none of the artifacts that was in the first plate I had with Bambu PETG.

(Edited)

@3dprinting4silv

Boosted

To this day this is my favorite print. I printed this from Printables. 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. Magicsmokestat has pored hours and hours of work into this and I cant believe that he posted it for free. If you are on the fence about printing this one I assure you it is amazing.

(Edited)

The designer has replied

@marimo

Thanks so much for your encouragement and support! 3dprinting4silvas helped me debug the Clamp design last year, and encouraged me to post on MW. Thank you for posting your Print Profile and making this project accessible to more people. I hope people have fun with this and inspire lots of young kids.

@backpckk

came out perfect on my a1 mini. printed purple in esun PETG and blue legs with elegoo PLA all using bambu generic settings. random question, but I don’t see any examples of the rocket with the reusable straw. I assume that takes the place of the PVC optional piece?

The designer has replied

@marimo

Beautiful colors. Glad it came out well on your A1 mini! A note for readers in the context of @Morgus 's thread on bridging quality: A1/A1mini extruder has a Bambu Studio max volumetric speed of 8mm^3/sec, and I believe P1P/S/X1C is 12-13mm^3/s. Good to know that you had success with eSun PETG. If anyone tries eSun with P1P/S/X1C, please post your results as well. As far as the straw pictures, that's my oversight! Current pictures are all of Core C (PVC), and Core B (straw) is the one posted here on MakerWorld. The two Cores are slightly different, and Core B is more proven, which is the posted file. I'll put adding the correct picture on my to-do list, as well as updating all the files on MakerWorld, and then getting new print profiles up.

@backpckk

one more note for people. some one posted a .scad file on cults3D for orings. I was able to use bambu .scad editor to size and print the orings in TPU. it worked great