I have created a simple knotted sphere in Rhino. Snappy generates a perfect mesh now... I used the same snappyHexMeshDict as in previous meshing of my guppy.
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| edge refinement at the cut | 
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| The red line is the edge for the Explicit feature edge refinement | 
Later I have done layer addition: 10 layers absolute thickness, expansion ratio 1.2. The result is not perfect to my lay eye.
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| The layer addition is not perfect | 
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