Also, is there anyway to tell slic3r to only build supports on the exposed

3D Printing
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Also, is there anyway to tell slic3r to only build supports on the exposed overhangs instead of everything that hangs? Back in RepG days I’d see this option & I just don’t wanna remove plastic midway up my model for no reason.

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It’s the support material on the top of the model I want to get rid of btw: http://i.imgur.com/Bst0KCu.jpg (incase my bad explanation wasn’t legible lol.)