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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.

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Take a look at the design of http://www.thingiverse.com/thing:147705

Some of the pictures show the extra little tunnel very clear.

Notice how the tunnel extends up to the hobbed gear to eliminate any chance of the filament popping (bending) out of its natural path

Direct-drive hinged extruder for E3D/J-Head hot-end (Prusa i3)