Hi Mike, Varian got it right. But, as Jackson said, you should talk to the people who are going to print it (if you're not doing it yourself) to find out what works. The requirements can be quite different depending on the process used. If it's an inkjet process, then you can probably get away with 200 dpi (or even less) without noticeable degradation in quality. It is worth finding out the actual required dpi because 200 dpi vs. 300 dpi will cut the render time by...let's see...4/9...so less than half the time. So, if a render takes 2 days instead of 5 (which it might at this size), that's a big difference.