This is a a 4-piece 3D printing "clone" to a Levoit Mini Air Purifier from Amazon
https://a.co/d/4hXKRhR
With the cost of all the pieces, it costs roughly $25 in comparison to the $50 Levoit Core Mini. Another change to the Levoit model is that this uses a linear compressor that sucks air from the top and filters through the inside and out. The Levoits suck air through the outside of the filter and blow air straight up. I find my model disturbs the air less this way.

Assembly is pretty straight forward. The enclosure has two holes that line up with the motor. The screws i used are flat-bottom instead of V-shaped. They can be torqued pretty good without warping the PLA enclosure. Depending on your settings, you may have to hammer the turbine onto the motor or glue the turbine. I found my settings worked great. It was a very tight fit. I added a small test square to test your settings. You may need to adjust your z-offset or line width. The test squre has a 1.325mm hole not 1,325mm...
Next you can glue or tape the top to the enclosure and place the funnel inside the enclosure. There's wire cuttouts for both the funnel and elcosure. I soldered the wires to the + - terminals on the motor so that there's no chance they'll fall off.
Once everything's put together, you just place the put-together parts on the filter and turn it on. The funnel should line up with the filter's top hole, which helps prevent air leaks.

The fan is not loud but it's also not the quietest. You can easily talk over it. It's as loud as talking softly/whispering

Other parts you'll need are:
2x M2.5 screws (6mm long)
1x 3-12v Motor (https://a.co/d/b2g5F5J)
1x H13 Core Mini Filter
A way to power the motor
Packing Tape to cover the bottom hole of the filter. Cheaper and faster than printing a plug.
Super glue to make the top and enclosure air tight. Can also use it to glue the turbine to the motor and the cables to the enclosure.

I used a 2.1mm x 5.5mm connector in conjunction with a 5v 2.5A
Connectors - https://a.co/d/4DAt5Uy
Power Supply - https://a.co/d/4xy9iJp

The motor used can go up to 12v but will quickly heat up to the point that the PLA will get soft and the turbine fan will fly off. I've noticed anything above 9v will heat up the motor. You can even use a 3v power supply but the suction will decrease. I found 5v to be the sweet spot. Power draw at the wall is 8.2W