MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Your question is a little vague. Are you asking about the cogs (the wheels that look like gears)? That is ProtoTank_Cog.stl, located here: https://www.thingiverse.com/thing:972768/files.
If that's not what you are asking about, could you please provide a little more detail? I'm definitely willing to help you out.