We'll begin by searching Thingiverse for a bathroom sink/vanity. A quick search yields models for soap dishes, toothbrush holders, and filters—not exactly for what we were searching. Let's try the same search on GrabCAD. This search yields much more promising results. We'll select the model Bathroom Sink assembly by Emil.Rindell.
Looking at the file types, we see IronCAD 2011, STEP/IGES, Rendering, STL, and Other. We aren't using IronCAD 2011, therefore, we won't have access to the native file type. However, he has provided
.step/.iges that is a universal file type, along with
.stl, which is our print-ready format. Let's download the model, and then look at
.stl in MakerWare as shown in the following screenshot: