Two convenient methods of printing enlarged document or images follow:
1. PDFPoster is a command line utility for linux that will enlarge an input PDF document so that you can print it out on many sheets of paper.
2. PDFImages is a command line utility for linux that extracts the images from a PDF document. Then, you can use that image at http://Rasterbator.net, which will configure the image for printing an enlarged version on many sheets of paper. Pretty slick.