Hi, Tom. The Scrapbook is a funny place to be saving text. Scrapbook pages are saved as graphics, not words. In effect what you're saving is a bitmap that represents the
appearance of the text, rather than the characters that convey its meaning. And what's saved is saved in the resource fork of the Scrapbook File, not in its more readily-accessible (but empty) data fork. That being the case, no application that extracts the text characters from "any file", such as Word, BBEdit or TextWrangler, can pull out the content of your text panes and save or print it all as a text file or word processing document.
The Scrapbook's primitive design goes all the way back to the beginning of the Mac OS. On its face it hasn't changed much, if at all, since 1984. Your best bet is probably just to place the pages from your Scrapbook one at a time, one after another, in a word processing document, then save that document for printing.
There are (and have been since about 1985) many more flexible and feature-rich little scrapbook-type apps that could be used instead of Apple's Scrapbook to store your collection of graphic snippets. Some of those little apps and desk accessories must still be kicking around on the many Mac classic software download sites, which I know you're well aware of. I don't use such a program myself, or I'd be happy to suggest one to you.