A few nice 3D Printer images I found:
Tinkercad name sign
Image by Creative Tools
Printing a funny name sign with the be3D DeeGreen 3D printer.
3D Print Photos
Image by rafolio
The grey plastic is semi-perminent support material that the printer lays down in order to support pieces of the model during the process of printing. This is hacked away at the end to leave the harder, white plastic