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There should be more books at Gutenberg.

Also by the way I just searched for 3d printing and found nothing. Either there are no books, or the search query makes things too complicated, IMO.

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Gutenberg is nearly all books that have lapsed into the US public domain by dint of being published 95+ years in the past. Which broadly explains why you hit nothing for 3d printing.

As another commenter said PG is almost all books from 95+ years in the past due to copyright law in the US. We partner with a sister organization, the World Library Foundation, who have a self-publishing portal for modern works by authors who wish to put their own work in the public domain. You might want to look there for more modern material. https://self.gutenberg.org

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