Levoit Core 300 filter insert

This is an updated model of my previous Levoit Core 300 filter insert: https://makerworld.com/en/models/812044#profileId-753601 It seems there are different variations of the 300 and 300s models with different internal features. This one should fit all of them.The insert holds a lot of activated carbon compared to the original one so it should last you several times longer. It is also easy and cheap to replace it. Simply discard the used up activated carbon and fill it with fresh one. There are two options available:Option “_A” uses M3 heat set inserts/nuts.not as commonwill stay in place and won't fall into the basket during assemblyOption “_B” uses normal M3 nuts.commoncould fall into the basket during assembly, requiring you to empty it and reinstall the nutsrecommended to use glue to hold them in placeThere is a “SLIM” and normal version of each option. I recommend you try the “SLIM” version first. It doesn't hold as much filter medium but it doesn't restrict the airflo