Water Rocket Gardena Quick Release Nozzle

by USWaterRockets, published

Water Rocket Gardena Quick Release Nozzle by USWaterRockets Apr 20, 2015


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Thread this nozzle onto a soft drink bottle, click it into a Gardena style Garden Hose Quick Release, add water and compressed air and you have yourself a Water Rocket!

Caution: You use this part at your own risk. We cannot guarantee the safety of this part due to the differences between printers and filaments. Always safety test parts like this and follow proper safety measures when dealing with Water Rockets. Use with adult supervision.


The full report on this part and complete instructions for use are on our website:


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Is the STL file in MM?

So... any chance of a 3d printed Robinson coupling ?? :)

After a few abortive attempts, my first print on my first 3d Printer, it has come out really well.

One thing I have found is that for those of us in the UK the swing top beer bottle seals seem to fit perfectly. http://www.ebay.co.uk/itm/Replacement-red-seals-swing-top-flip-top-bottle-stoppers-washers-home-brew-/171643090005?var=&hash=item27f6b9b455:m:mm21hQtiyE0wuEfMdQl11Sg

Nice work, now can we have the fin holders, please?

Thank you very much for this gadget, as well as the adapted tornado tube, my son and I are having great fun with our water rockets, thanks also to all the information on your web. Our highest launch is 109 meters. Could you please upload your self aligning fin brackets, these would be a great help. Thanks again.

To Dan Spangler - look at my improved nozzle. http://www.thingiverse.com/thing:884007 and the drawing and description in http://www.thingiverse.com/thing:879277. The problem is that the O-ring groove on the upper side of the groove is parallel with the printing plane. Therefore there will be an overhang problem. I've made a sinecurve shape so the printer do not have 90 degree overhang. The stl-file is in progress so dont relay on it before it is 100 %. Comming soon.

To UsWaterrockets.
My improvements is that I have made another seal that utilize the leftover plasticring on the bottle as a seal. In connection with at wound sealing with insulating tape I have made at very tight seal witout the use of an O-ring.
As you can se I have also made improvements to the inside shape of the nozzle. This I am experimenting with at this time. Hope you wil do the same so we together can make the perfect nozzle.

gardena nozzle
Gardena nozzle

I'm having trouble with my print, everything fits perfectly except the #111 O-ring. it gets jammed in the female Gardena coupler and wont go all the way down. I believe the problem is with the O-ring groove the width is too narrow and the ID needs to be smaller. Is there any way you could release a model with a slightly larger O-ring groove. I have a Zortrax M200 printer and i believe it may be trying to compensate for tolerances in a way that's different then the printer you are using. Other then that, Love the model, really great design.

Thanks for the kind words about the model. I think from what we have seen from other printers is that the o-ring groove tends to close up a little bit depending on how the slicer or printer creates the overhang. We had to add a small radius to the bottom of the groove to allow the model to print without support material, which was a huge pain to remove from the threaded area. You should be able to solve your current problem by rolling a hacksaw blade or some sandpaper through the groove. But go really easy because the o-ring depends on really close tolerances and if you go too deep it will leak.

Another point to note is that the nozzle opening is slightly undersize from a standard Gardena connector. That way you can use these for upper stage nozzles or use them with soap in the water for foam propellant. Some people prefer the small nozzles for a longer thrust time. You can open the nozzles wider with a drill if you like to go bigger.

I will play with the model and see if I can get the o-ring seat to be more consistent for you. Thanks again for the feedback.