The biggest one is communication. If you need help, you can ask for it. Even sending emails saying things like, “this has been serviced, please note this for next time…” matters. Communication’s a big thing here.
Problem solving is massive too. Sometimes you’ll notice that something isn’t right on the production line, and you have to work backwards to figure out what went wrong and where the issue is.
It’s helpful to have good manual dexterity (be good with your hands) and have attention to detail, because some of the parts I work with are tiny and fiddly. The heads of the machine are about the size of my head, but the bits inside need careful, precise work.