(Not RPG-related. Sorry. Also not a good idea, so don’t do this.)
So the one feeble fan trying to keep my laptop cool just wasn’t succeeding. The obvious “solution”: remove that inconvenient obstruction blocking the fan.
The before pic, with scale:
The fan exposed; shortly after this pic I tore off the grille entirely.
Did it help? Seems like it. Hasn’t overheated yet.