I have almost finished reading Sitecore Helix documentation online when I had to travel abroad. I had to think of how I will finish it on my ebook reader (Kindle). I have therefore started to explore some options how to download it and make an ebook out of it.
At the end I had used HTTrack to download original documentation as HTML files. I have removed lots of unnecessary stuff for ebooks (side menu, breadcrumbs, footer, prev/next buttons and so on) using Notepad++ and regular expressions. I have used Sigil to create ePub first and using Calibre to convert result to mobi and pdf formats.
You can download Sitecore Helix Documentation 1.1 (August 2016) on below links:
- for mobi -> https://github.com/chorpo/SitecoreHelixDocumentation/blob/master/2016.08/Sitecore%20Helix%20Documentation%201.1.mobi
- for ePub -> https://github.com/chorpo/SitecoreHelixDocumentation/blob/master/2016.08/Sitecore%20Helix%20Documentation%201.1.epub
- for PDF -> https://github.com/chorpo/SitecoreHelixDocumentation/blob/master/2016.08/Sitecore%20Helix%20Documentation%201.1.pdf
Feel free to comment some mistakes or suggestions how to improve these ebooks.
This is my first post. More to come!
UPDATE:
I have released similar e-reader compatible guidelines since this initial post. Take a look here.
You can also go directly to my github and browse my repositories.
straight to the core 
Stumbled upon your post via https://weblogs.asp.net/soever/sitecore-helix-pdf-epub-mobi and I actually found https://github.com/Sitecore/Helix.Docs
The Contributing Guide covers how to actually build an HTML version of the site, but you can use ‘singlehtml’ as a parameter to generate a single page that can be printed/saved to PDF.
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