Note: Printing patterns from Mozilla Firefox may result in incorrect proportions. We recommend using a different internet browser, or right-clicking the download link and selecting Save link as from the menu to save the file to your computer instead, and print it from there.
There was another Online Extra for this article:
Issue 121 Online Extra
Adobe Acrobat PDF
Infill Smoothing Plane
The patterns are available to download in this Online Extra. (See download link above)