I honestly think this is the worst use case for a 3d printer. The part isn’t improved by printing. You can buy the part easily. The cost of modelling time and printing is more than the replacement. There’s a decent chance the replacement part would have arrived quicker than the print took… Sorry to be a bore, it’s better than an octopus or another benchy, I’ll give you that.

Nice

A quick search for 2 channel 24v fan controller yealded the below link. Not saying this is ideal for your scenario but something similar will work and can be powered with a power brick. Doesn’t look like it comes with instructions though so I’m not sure what current it requires. The temperature sensor could work to make it turn on when the printer heats up as well.

https://www.amazon.co.uk/Channel-Temperature-Controller-Governor-Display/dp/B083R97GZ1

I disagree that the main reason is thermal runaway. It is more likely to be underrated components that can’t handle the current. This would not be immediately apparent and does usually come from lower quality printers.

Don’t rise to it, bullies do it for entertainment or to look big. Keep your head down and focus on the things you enjoy in life. Be open about your autism, you never know where you might find some allies.

How do you get them to put rules in place that stop them from being corrupt. It’s a crappy downward slope.