This was captured from a SketchUp model found on the 3D Warehouse. Credit goes to saikindi for that model. I then scaled it down (quite) a bit in SketchUp to produce a model capable of fitting in my 3D printer, then imported it into Tinkercad to clean up the file further. I used Repetier as the printer controller and Slic3r to slice it, and had no issues with either software.

The 3D viewer doesn't give an accurate representation of how the model looks when printed. The model doesn't appear triangulated or full of polygons at all.