
The plugin is easily installed into Sketchup by using the instructions linked below. In the image above you can see how it appears – a simple link to a wizard that sets up your model for 3D printing at i.materialise’s service. You can view examples of actual Sketchup printed models here.

This particular plugin drives printing to their service, obviously, so if you’re intention is to use a different service, then you should use another plugin, such as CADSpan’s. You could also consider using QuickArc’s 3D viewing software, which can read Sketchup files and convert them to .STL.
Via i.materialise (Hat tip to Martijn)