Fan dampers / Screw holes protection

As I've tested several of duct / fang models, I've mount / unmount my fans a lot of time... and because I'm lazy, I'm using an electric screw-gun... So, I've damaged a bit one of my fan fixation holes and decided to print a small piece to protect it (and the others) from bigger hurts.

In the same time, I've made a quick and small damper for them, just in case vibrations increase their noises, or make fixation screws of the fang support will come loose.

This is definitively not essential pa