Simple Air Filter/Purifier and Freshener

It's hayfever season lately, and I had a bunch of cheap 5015 fans lying around. So, I took them and designed a simple air filter/purifier and freshener.

BOM

1. 10x M3 Heatset Inserts
2. 8x M3 Nuts
3. 10x M3x10 SHCS
4. 8x M3x25 or M3x30 SHCS
5. Activated Carbon (example: https://www.ebay.co.uk/itm/184379211538 )
6. HEPA Filter Cotton (example: https://www.ebay.co.uk/itm/364026099275 )
7. 5.5mm Barrel Female Jack (example: https://www.ebay.co.uk/itm/362440018788 )
8. 4x 5015 Fans (example: https://www.ebay.co.uk/itm/384965872253 )
9. Toggle Switch (example: https://www.ebay.co.uk/itm/254035393217 )
10. 12V or 24V DC power supply with 5.5mm connector (example: https://www.ebay.co.uk/itm/225019408019 )
11. Optional: Air freshener with reed diffusers

Assembly Instructions

1. Print all parts. Note that the activated carbon container should be printed with triangle infill at 40% density, with 0 top and bottom layers to create a mesh which allows air to pass through.
2. Solder together the wiring. Connect the motors up in parallel with the power source.
3. Insert heatset inserts. Look for the 4mm holes
4. Mount the 5015 fans and secure them with M3 nuts and bolts
5. Insert the 5.5mm barrel jack. I'm not sure if these have standard dimensions, so I didn't include any way to secure them. Just hot glue them in place
6. Insert the toggle switch. This can be fastened using the threads on the switch itself.
7. Stack all the printed parts together and fasten them with M3 bolts. Use the HEPA part to clamp in a piece of HEPA filter cotton between the ducts
8. Add activated carbon to the carbon container
9. Optional: add air freshener liquid to the top with reed diffusers
10. Connect power and enjoy

If you've found this model useful, feel free to tip me a buck or 2
https://ko-fi.com/henryj