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The file is valid-ish and prints fine, but agree with a few members, you do need to flip the normals and chop 1mm off the bottom - maybe a v2 should be uploaded by Mr Nelson to help people with these issues.
But it is intriguing that some slicers just can't handle the geometry?
My trusty MakerWare wouldn't slice, but S3D and Cura both sliced really quickly and via Cura on my UM2 it printed great.

Persevere - it will print with a couple of tweaks!