I’ve installed fan’s on mine, although I come from a place of zero CNC experience… and haven’t even started producing any chips yet.
I saw and read comments about steppers skipping, thermal shutdown and melting PLA, much of which has now been explained to me as unlikely. However, before that I decided to take advantage of my control board having multiple fan outputs, and run the wiring from the beginning. I’m also planning to enclose the work area, so wanted to preempt any issues given the minor cost increase.