Meshmixer Flip normals
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=pa9R-gPUNwg
when we import model from internet for 3d printing sometimes faces are reversed to correect it meshmixer flip normal option is vary useful .here we see how to do that. this model is downloaded from thingiverse • https://www.thingiverse.com/thing:376601
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