Small vibration damping pads to be printed in TPU that can be inserted in each corner of an Arctic F9 PC fan. Try some different amounts of infill to see what works best with your flavor of TPU. They clamp in place pretty well, but you can also use a bit of glue or double sided tape to secure them better.
I've printed these in NinjaTek NinjaFlex TPU with a .4mm nozzle. Sliced with 2 walls, 4 top and bottom layers, 50% infill with the cross-3d pattern in Cura.
I don't know if these fit any other Arctic fans, they don't on any of the other models I own (P12 and F14).
The author marked this model as their own original creation.