Error-free? Typesetting and printing have never been error free. Cold-type typesetting was more of a sweatshop operation than any scriptorium; it usually involved armies of "apprentices" (i.e., unpaid child labor). And for 100 years after Gutenberg, wealthy patrons kept the scriptoria in business by insisting that only hand-copied books were "real" books. It was the emerging middle classes--growing ranks of merchants with new wealth--that drove the demand for printed books.
Originally Posted by Maris