Hepa filtr for Creality K1 K1c from Xiaomi Robot Vacuum cleaner cartridge

I had 2 cartridges for the Xiaomi robotic vacuum cleaner at home that I had no use for, so I used them for the fan on the back. . Cartridges cost approximately 10 euros for two pieces. 

https://www.mall.cz/prislusenstvi-roboticke-vysavace/4robot-xiaomi-mi-robot-vacuum-1gen-100089649101?utm_source=heureka.cz&utm_medium=cse&utm_campaign=MP&utm_content=prislusenstvi-roboticke-vysavace&utm_term=27286565