The 3d diff feature on Github ( https://github.com/blog/1633-3d-file-diffs in September 2013) isn't exactly new,

3D Printing
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The 3d diff feature on Github (https://github.com/blog/1633-3d-file-diffs in September 2013) isn’t exactly new, but it was new to me. Cool.

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Cool. However, I was looking at some of my parts and I can’t figure out how to engage the feature. https://github.com/NicholasSeward/ConceptFORGE/blob/master/GUS%20Simpson/STLs/HUB%20BOTTOM.stl Any ideas?