i didnt like where my prusa mk2s x stop was. it didnt work well, plus it later broke on me. the only thing i could find that can trigger the x stop was to make this fan shroud/cover. so anyway ,what the saying 2 stones one bird, yup fan cover and x stop trigger in one. use the original screws as they are plenty long. also was watching Avenger movie when making this. which didnt influence me one bit.