Paid subscribers and SketchUp for Schools users have access to additional functionality in SketchUp for Web for scaled prints. Switch the Print Mode drop-down to Print to Scale to set up a one-page scaled-print.

In Print to Scale mode, your print preview is rendered with SketchUp's parallel projection camera. You can still pan, orbit, and zoom your model: but now, as you zoom, the implied scale of your drawing will change. Similarly, changing paper size will change the implied drawing scale.
To choose a specific drawing scale, simply type in the scale you prefer and the print preview will resize your print. Note: zooming in or out will change this scale once you’ve set it.
Click Print Scale to display the scale of your drawing on your print if you like.
