Can I replace the cooling fan blade for the hot end on creality ender 3? I broke one of the blades of the fan and that's making the x-box vibrate. Other than that it works fine and I can still print at a very low flow rate and a lot of noise. Will replacing the blades, not the whole fan work?

Found this and how to replace on thingyverse:

https://www.thingiverse.com/thing:186979
It will work, but likely with reduced performances: designing blades is not an easy task and the ones you can print will not be as good as the ones designed for that specific fan.

Overall, do it for fun before you replace the fan anyway.

IF your fan has symmetrical blades (unlikely), another option is to break the opposite blade to balance the fan.