Anything messy like being a printer tech sounds like the worst thing to be wearing formal wear for.
Like, you wouldn't teach an art class in formal wear because, well, with all the paint and stuff moving around, and literally being flung if the project in play demands it, things will get messy fast, it shouldn't be any different for printer techs dealing with toner and stuff.
And you especially wouldn't teach ceramics where you and a bunch of other people are going to be literally playing in mud, in formal wear either for the same reasons as above.
Also, if you're dealing with printing presses where you're constantly around exposed moving parts, wearing a tie in those scenarios could lead to a brutal, untimely death if it gets caught on a roller or something.