DIY 3d Printed Air Humidifier

I've had a cheap water atomising module for a long time that had not been used for any purpose so far, so I decided to design a DIY humidifier set.

The final design is pretty small (only 11 x 6.5 x 2.3 mm), so it can be transported easily. However, the disadvantage of the size is that it shouldn't be used with larger PET bottles, since the humidifier could tip over.

Can be used for:

1. Humidifying dry places
2. Aromatherapy
3. Humidifying to make an optimal environment for plants
4. Smoke effect for photos, videos, animations...

1. Atomiser module from Aliexpress
2. 3d printed parts from my Printables account
3. PET bottle

Firstly, let's print all the 3d printed parts.

I recommend that you print the part that holds the PET bottle and the ultrasonic piezo (in my case, the part printed with a black filament at the bottom of the photo) with 100% infill to ensure no water sinks through the model. All the other parts can be printed with the basic settings of your slicer.

1. printed with PLA filaments
2. can be printed with no supports
3. I used my Bambu Lab A1 Mini printer

When everything is printed, let's start assembling!

Now, insert the ultrasonic piezo into the smaller hole of the holding part. Don't forget to cover the piezo with the transparent rubber sealing included in the package.

Important note: Please, place the piezo with the wires pointing upwards as shown in the picture.

Then, place the round part with a hole in the centre on the piezo. This is to prevent rotating the piezo and hence to pull the wires out when sealed with the threaded part we're gonna insert in the next step.

Now screw in the round threaded part that has a little funnel on the top. By this, you tighten the seal to prevent water from flowing out.

Take the assembled piezo holder and mount it into the base as shown.

Take the PCB and mount it into the base. Make sure the wires don't exceed the level of the base by inserting the wires inward.

If you want to, you can print the cover for the PCB and insert it onto the circuit board to prevent dust and other impurities from making contact with the PCB.

Take a small PET bottle (please don't use larger ones that could tip the humidifier over or might cause water to spontaneously flow through the atomiser's membrane) and create some small holes on the bottom of the PET bottle to allow air to escape. Then, for better sealing of the bottle, place a rubber band below the thread. Now you can mount the bottle onto the humidifier.

If you now plug your humidifier in and it doesn't work, don't worry, it shouldn't. If it doesn't, that's a sign that you have done everything well so far. But why doesn't it function? Well, there's pressure from the other side of the water 'tunnel' which makes it impossible for the water to flow through. You can correct this easily by untightening the sealilng screw a bit, which allows the air to escape. When the humidifier starts making mist, tighten it back, and everything is now done.

A final note: You don't have to use PET bottles, you can just pour some water into the place for a bottle instead, it will work just fine, but won't last as long as if there were a bottle.

I wish you a successful project!