Sunlu S4 fan deflector.

These fan deflectors are designed to minimise localised spool heating in the Sunlu S4. The fan deflectors can be left installed and do not need to be removed when in use.

They are designed to work with my anti-tilt cradle, which places the rollers higher and further apart so that spools can't roll off them so easily. https://www.printables.com/model/1036151-sunlu-s4-cradle

I'd suggest printing them out of high temp plastic. Print on their side. 2 normal and 2 mirrored if you want to do the full set. Apologies, but they do need supports under the “axle”. 

I've included 3 options:

• Solid without vents
• Vented
• And Vented with additional airflow - This last one is likely the best one to use.