This is an upgraded version of the Qidi X-Plus 3 Carbon Filter that comes with the new models. This may require modifications of the back panel. If you don't currently have the carbon filter installed there is a template and instructions that are available through Qidi Tech support.
It's not perfect and my need a little tweaking to work properly. I used m3 threaded inserts for attaching the fan enclosure and 10x2 magnets to hold the pieces together.
Printing is a little tricky and you may need to play around with the supports. I ended up printing the fan enclosure with the fan opening up and painting support under it. Because that part ends up being hidden. I also used m3 inserts in the fan to attach it to the enclosure. This made assembly easier.
Update:
I tweaked the model a little bit which will hopefully improve the mating of the carbon and fan housings.
The author marked this model as their own original creation.