I’m currently designing a 3D printable fan deflector for the Snapmaker.
Here is a screenshot of my work so far:
Here’s a nicer render:
I am still trying to test it and I may be able to modify the design to point the fan towards the extruder for better PETG and PLA printing 
I did get inspired by the card fan deflector in this post, however, I wanted a more permanent, easier solution that could be easily installed and removed. So I started designing 
My first design worked, however, it was too large at the bottom and would touch the print bed before the nozzle.
Version 2 is lower profile and should not touch the nozzle, however, I am still printing it (as I just finished designing the iteration) and haven’t tested if it actually deflects the air decently enough.
I’ll upload the final version to Thingiverse and share it with you guys in a different thread in the future
And to give credit where credit is due, I am using the Snapmaker DIY Laser Module case model to design the deflector around.
Thanks,
Greg