I've been printing Poser images for some time and never had a serious problem with textures not coming up to snuff. I use a Xerox laser printer set for default printing at 600dpi, and the images come out sharp as tacks, even when the image I send to print is more like 150-200 dpi. Yep, larger textures are always better, but not completely necessary.

docandraider.com -- the collected cartoons of Doc and Raider