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I have a Nevermore filter with 24v fans, would it be fine to connect them to the parts that I have circled on my Prusa MK4?
Or is that dangerous?
You might be able to but you really shouldn't. At the best you wouldn't have control over fan speed. Find the wiring diagram for the board and use a fan header
Per https://help.prusa3d.com/article/xbuddy-and-loveboard-electronics-wiring-mk4_413095 it looks like you dont have any fan headers, you might be able to repurpose the unused ambient sensor header but no clue sorry. You might try splicing off the part or hotend fan? If you really wanted to use the dc input you might need a voltage step down buck converter or something depending on what your PSU is putting out
Idk what type of connector my printer uses since my fan is different
How about a raspberry pi?
Powering the fan from gpio pins probably isn't going to work out well either, they are 3.3v and 5v. Powering the fan from the PSU is going to be similar to powering a pi off it, I believe you should step the voltage down to what each needs, where the fan is 24v I think the pi is 5v. Your PSU is probably 115 or 220 v. For connectors I would expect to have to redo them yourself with micro fit, molex, jst or w/e you want and can get. On some of mine I just did single pin molex on the pins of the white female connector for fan headers, it doesn't lock but it works if you don't have a lot of movement. This page is awesome for connectors info https://www.mattmillman.com/info/crimpconnectors/common-jst-connector-types/
Seems complicated I might just connect it to and adapter I can plug my 24v laptop charger into or just getting a buck converter
Honestly if your going to go through all this effort to make this work, and already have a pi, I would suggest instead upgrade the control board to something with extra fan headers, led heads, etc and switch to klipper, there have to be guides out there for your specific printer
Incase there's no fan header left you can always get a variable buck converter with a rotary knob to manually set the speed on the fly atleast.