Skip to content

WRLS (Water Rocket Launch System)

Creation's quality: 4.6/5 (6 votes)
Evaluation of members on the printability, utility, level of detail, etc.

3D model description

This is a water rocket launcher, which can be fully 3D printed using using the 19x2mm TPU seal and the Inlet_Metric, or use store bought O-rings.

Here's some footage of it in action:

O-ring sizes:

Inlet_Metric O-ring
19mm (inner diameter) 2mm cross section
Inlet_Imperial O-Ring
3/4" (inner diameter) 1/16" cross section

To adjust the release tightness, you can scale the printable O-ring or the pin, as pictured in the gallery.

There's two options for fixing the launcher in place:

Mount_Heavy_Duty is fixed directly to something solid (wood etc.)
Mount and Leg_Peg for removable use, to ground or sand.

Assembly instructions below. All parts should be printed with 100% infill and with 0.2 layer height for optimal clearance between parts.

1 Print all parts and get the hardware if you decide to use the actual valves and O-Rings
2 Insert the O-Ring to the Inlet
3 Glue the Bottle Adapter to an empty bottle, or print a rocket
4 Attach a cord to the Pin and connect the pump to the Inlet
5 Fill the rocket with water, and combine it with the Inlet and insert the Pin over them
6 Insert the assembly to the Mount, which should be secured in place
7 Pump to desired pressure
8 Launch by pulling the Pin
9 Houston we have lift off!

13 Houston, we have a problem

Remember, this uses high pressures, so adult supervision and common sense is a must. The maximum pressure tested so far has been 10 bar (145psi) with the PVC Rocket

More rocketry coming soon, so stick around!

Toss a like, post a make and maybe follow
over at the IG's

3D printing settings

To prevent leaks, use random location for the layer change. The Z seam is the main reason for leaky prints under pressure. The Leg_Peg is recommended to have supports to improve stability.

  • 3D file format: RAR and STL
  • Last update: 2020/04/21 at 10:27
  • Publication date: 2020/04/14 at 18:59





Hi there! I'm just a simple man doing simple designs, is all. Donate for a good cause

Issue with this design? Report a problem

Best sellers of the category Gadget

Add a comment

Would you like to support Cults?

You like Cults and you want to help us continue the adventure independently? Please note that we are a small team of 3 people, therefore it is very simple to support us to maintain the activity and create future developments. Here are 4 solutions accessible to all:

  • ADVERTISING: Disable your AdBlock banner blocker and click on our banner ads.

  • AFFILIATION: Make your purchases online by clicking on our affiliate links here Amazon or Aliexpress.

  • DONATE: If you want, you can make a donation via PayPal here.

  • WORD OF MOUTH: Invite your friends to come, discover the platform and the magnificent 3D files shared by the community!