How do I report an unsafe job without being seen as a troublemaker?

That fear is real, and it is worth naming. But weigh the two things honestly. A label fades. An injury does not. If the place is truly unsafe, staying quiet to protect your reputation is a trade that can cost you far more than a reputation ever would. There is a way to raise it that is hard to paint as troublemaking. Stick to the facts and the safety of everyone, not just yourself. Say plainly what the hazard is and what could go wrong, calmly and in writing. People who report a real danger once, plainly, without drama, are rarely the ones who get labeled. Start with the person most likely to actually listen, not the loudest authority. You only need one reasonable ally to make this a shared concern instead of your complaint. Speaking up for safety is not being a problem. It is doing part of the job right.