I noticed that when the filter from my Molekule Air Mini said it needed replacement that it was still quite clean, however, I already ordered a replacement so i replaced it, but, instead of throwing out the “spent” one I made a fan adapter and plug for it. I designed a simple plug for the bottom of the filter and a 120mm fan adapter for the top. I then attached the fan to the adapter and glued it all up.

Note: I found that a slight elephants foot on the plug really made it sit perfectly making gluing it in place really easy and it sits really flush. Thank you bad bed leveling :)

Plans:

• Add an arduino controlled power supply
• Design and print an overall case
  • https://www.printables.com/model/1233031-diy-air-filter-case
• replace screws attaching the fan to the adapter with shorter ones

Materials:

• 120mm Fan -
  • Im using this model for power simplicity and speed control: https://www.amazon.com/gp/product/B0BG4C9H5P/ref=sw_img_1?smid=A2ZLBPY6Z7FDMB&th=1
• Air Filter-
  • Any one from amazon will do like these: https://www.amazon.com/dp/B0CKYTX8WX?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1