Aficionado

Hi everyone, I'm mostly a newbie to vector editing, so I hope someone can point me in the right direction. I've created a black and white vector graphic using Affinity Designer. The graphic will be incorporated into a printed book, and the printer needs it as a 600dpi 1-bit black and white file — I think a vector format is preferred. My document resolution is already 600dpi, so that's covered, but I'm struggling to work out how to use Affinity's export options to save out my graphic as 1-bit. Any ideas? Thanks, Gabi