Source from: http://locksley90.blogspot.com.au/2008/11/exporting-simulink-models-to-eps-or.html
To export Simulink models/block diagrams to eps or other image formats is easy. First, open your model. Next, use the print function to export to other formats (note the letter ‘s’ that must precede the model name, which is entered without the ‘.mdl’ postfix):
print -smodelname -dxxx -rresolution filename.xxx
For example, to export simmodel.mdl to eps with a resolution of 300 dpi, type
print -ssimmodel -deps -r300 simmodel.eps
The file simmodel.eps will be created in the directory where the command is entered.
For more information about image formats and print options, type