TrelloExport 1.9.74 is a maintenance release, due to adapt the injector (the component that injects TrelloExport link in the print menu) to the new Trello HTML layout.
This is a quick fix to let TrelloExport be visible again: it is now at the very bottom of the menu, see the image below:
Version 1.9.75 is out to fix again the injection mechanism.
Nicer styling to come later.
Your feedback is always welcome. If you have any problem please open an issue on GitHub, I'll do my best to fix it quickly.
If you wish to support the development of this tool, like Richard did (thanks again!), you can make a donation.
You can now get TrelloExport from the Chrome Web Store at this URL.
If you want the source version, get them on GitHub at https://github.com/trapias/trelloExport, and follow the installation instructions in the readme.