I needed to increase the efficacy of the filtration against odor so I remixed the Silica Gel container for DRY Box to fit in top of the Xiaomi replacement filter
I observed that regardless of how small the opening pattern is some dust of the carbon will get loss specially at full blast of the air filter and a simple solution was to add (Extractor hood filter cloth or Air Vent carbon Filter insert) in the top and bottom side of the container to hold the carbon grains and dust. Both can be found in Amazon, also both can be cut to size.

For the Xiaomi Air Purifier Activated Carbon upgrade – Body file only I did do the following in the slicer:
• Center the object
• apply a cylindrical modifier
• adjust size to 105mm for the x&y dimensions
• center the modifier
• remove top and bottom layers
• added a Honeycomb infill with 13% density

just in case I'll attach the 3mf file