Everyone must have a functional PC fan attached to some old PC that's lying around and piling up dust, and if you're in luck then a 12v adapter from some unused device. I've tried to 3D design 3 attachments to the fan so that I am able to: 1. screw in the first attachment using 4 M3 6mm hex screws that coincide with the fixation holes of the fan, made another hole to direct the wires into another area, and fixation holes into which the 2nd adapter clicks into; 2. simply insert the 2nd adapter into the first with the help of 4 spikes that have designated holes, and then in the designated area insert 2 charcoal filters (2.5 mm thick) cut to size, after which a 36 mm hole serves as an exhaust of the treated air and as an adapter to any vacuum pipe that you might like to attach in order to direct the treated air to another area. The last attachment is merely a box for the button that you need to glue (super glue works best) on top of the device. It has enough space and a hole to allow wires to cross in and out. The GND wire (BLACK) is led out through this box and directly attached to the Female DC power connector, whereas the 12 v positive wire (RED) is soldered into one side of the button and then another wire is soldered to the other and a wire is led out from button box and attached to the power connector.

Supplies

3D printer

Solder iron

Glue gun

4 M3 6mm hex screws

hex key

liquid insulation

Step 1: 3D Printing and Inserts

Print the 3D models, cut out the charcoal filter to the according size, and insert 2 cutouts into the slot

Step 2: Adaptation of the Attachments

Determine the flow of air on your fan and screw in the first adapter to the output side after inserting the needed wires into the designated hole. Snap in the 2nd attachment to the first (it is properly aligned so all you need to do is adapt the spikes to the designated holes). Use glue to seal any small holes that are present between the adapters.

Step 3: Wiring

After printing the button case, wires are passed through the designated holes and 12v wire is soldered to button contacts. I've added liquid insulation at the soldering site but there isn't much need for that. Finally, the wires are attached to a female DC power connector into which the 12v power source is inserted