Rattling Fan Fix ( probably )

First things first: If your fan rattles due to an imbalance or bearing damage, this model doesn't guarantee that it will be quiet again. It may or may not work. So please don't judge this model by whether it worked for you or not.

Many will know this annoying rattling that the fans sometimes or sometimes always produce. Unfortunately, many fans do this even when they are fairly new.
The first step should always be to clean the fan. Often an imbalance is caused by very fine plastic strings which are sucked in by the fan. If that no longer helps, this clamp comes into play. 

It is attached to the fan and exerts a little pressure on it, like when you place a finger on the fan. Important, the clamp itself is often not sufficient. Often you have to put some paper or tape under the clamp to increase the pressure on the fan. This is different for each fan.
If the fan starts to rattle again, you can try it again with a little more pressure.
This part weighs under 5 grams and negligible in terms of weight.

This clamp will hopefully save you some nerves and delay the purchase of a new fan.

If you like this project, check out my other designs too!