Garden hose venturi pump

by jag, published

Garden hose venturi pump by jag Aug 23, 2012
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I designed this to mix a small amount of liquid fertilizer into a stream of water from a garden hose.
I have a worm composter that produces quite a bit of liquid fertilizer and I wanted to dilute it and sprinkle it on my lawn.


Print it out.
Break out the little support cylinder in the bottom and cut out the think membrane over the hole.

Place a rubber washer in the female threaded end.
Tap the vacuum port with a 1/8 NPT tap (don't force it and crack the plastic)
The hole is already tapered so hopefully it shouldn't be too much work to tap it.
Insert whatever 1/8" npt fitting you want into the port (JG fittings are nice)

Hook it up inline with your sprinkler or whatever.

I just ran the original venturi through netfabb to fix some problems. Hopefully it is good not.
Made a slightly different stl (called venturi 3.5) that should have slightly looser threads and has no built-in support material. I also ran this file through netfabb.

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Garden hose venturi pump by jag is licensed under the Creative Commons - Attribution license.

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Apr 16, 2016 - Modified Apr 16, 2016

Any chance someone could repair this mesh or export a clean STL, please? I'm trying to make a remix, but it won't import cleanly into TinkerCAD. According to Simplify3d, it's both non-manifold and has self-intersecting surfaces--if that helps at all.

jag - in reply to bfesser

I repaired the STL in netfabb. Give it a try now. Not sure why it had problems. OpenSCAD usually makes pretty clean STLs.
I made it a long time ago though...

bfesser - in reply to jag

Thank you very much for doing that. Unfortunately, while it checks out as manifold now, it still has self-intersecting surfaces and TinkerCAD can't import it. I'm going to download OpenSCAD and try to learn how to use it to fix this.

Prints good at .3mm / 3shell / 50% infill / 45mm/s

Tight threads, almost too tight. Vacuum is super strong on garden hose. Easily crushes containers.


I had the same problem with Slic3r too. I then used Blender to load the stl file and use the 3dPrint plug and click on Isolated button in the Cleanup section, then export the new stl file and slice the new stl file with Slic3r. And it works for me. I printed one out and test it with a garden hose. The only problem I have is it leaks with a tiny pin hole at the top of the hex area. probably need a dense fill pattern instead.

Really neat design, but it does not slice. It's not manifold and needs work in NetFabb to be printable, but the design is clever.

What are you slicing with? The included STL slices fine for me in skeinforge and simplify3d. No complaints at all from the slicer.
It's usually pretty hard to make non manifold STLs with openscad. It usually fails to export if it isn't manifold.

I used Slic3r (I know, I know...) and Cura. On a side note, how is Simplify3D? Some seem to love it, others not so much.

This looks perfect for a soap injector for my small power washer with garden hose hookup. I could then use a gallon of siding wash and have it suck it in before the power washer. All i need now is a anti flowback valve at the outdoor spigot so that soap can't get pulled back into the household lines and i would have something that costs around $80 online! Brilliant!

Hi, the scad file refers to this:


Is there a chance that you could share this too?

Many thanks!

question, do you sell these venturi's? if so How do I get one? Thx

Would this work for injecting bubbles or as a vacuum pump?

jag - in reply to nopoe

It should, it doesn't cut the bubbles up particularly small and I'm not sure how much vacuum it will pull. Maybe I'll put a gauge on it some time.

Nope, a thing-o-matic at 80mm/sec (peak)

Wow, impressed.

Very nice! I've been waiting for a printable venturi something or other. Not that I need one, but it seems a natural thing. Actually what I really want to see is a printable vortex tube for cooling, now that'd be fun...

Thanks! I was a little surprised that there wasn't one already.

There were a few venturis around but none of them were openscad so, rather than bodge some threads onto one of the other designs I just started from scratch.