A fan bracket suitable for the Olsson Block, which allows for independent adjustment of each fan.

Explanation: I used a structure with a center made of Teflon.

If you want to achieve this design entirely through 3D printing, the parts must have good heat resistance - it is recommended to use XT material. If you have better materials at hand, that would be even more ideal.

Another solution is to stick aluminum foil tape designed for high-temperature environments on the inner walls. This kind of tape can be purchased at hardware and building materials stores.