This is a remix of my base Kaif S2 Sleeve Model.

It is slightly larger than the provided Sleeve, but fits perfectly nontheless.

I recommend using PETG for printing, but PLA should work fine as well.

Make sure to use (tree) supports for the small lip at the bottom and the inner structure of the tube.

I used 15% grid infill, but you can choose whatever you like.

The inner parts should help with the air flow, but I already sense that I need to remodel it at a later point.

The f3d files are provided, if you want to modify or create a new variant.

Have fun.