This bookmarkelt relied on some internal peroprties of the Trello code which would change after a release which would break this bookmarklet. As such this bookmarklet is depreacated. Instead use Trello Printer

Printable index cards for your Trello project

1. Drag the trello-cards bookmarklet to your bookmarks bar
2. Run the bookmark from within trello board page.
3. Print on A4 in landscape mode, cut and and fold in half
4. Fork me on GitHub

Based on pivotal-cards by psd and inspired by David.