PC case fan spacer

I have a Cooler Master Q300L PC case and I installed some "be quiet!" case fans/chassis fans and they make a terrible hissing noise due to the blades being too close to the wall of the case, so I modeled these spacers that will space the coolers away from the wall so they run quietly.

instructions: you first screw the threaded part in the cooler and then use the other side (where the hole is) to screw it to the case, there are wings that you can hold to prevent the model from spinning while you are inserting the screw.

I used TPU I tried PLA and PET-G and TPU give me the best result.

Any feedback is welcome :)