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Hi,

  • download "Meshmixer", then import the right one .stl
  • click on "Edit", then "Separate shells"
  • a window opens (Object browser), click on the part in the list that you need (the selected object illuminates)
  • Click on "File" and then "Export" as STL binary format

Have fun

edit:
Or take this...
http://www.thingiverse.com/thing:244146

Heart Gears in separate files