Mandala (better file quality)

The original design is wonderful, but the file had many problems (tiny flat volumes, congruent polygons, ...), which caused slicing errors for me. So I went through repairing said problems more or less manually and finally checking and stitching everything in netfabb.
Also added a flatter version for faster printing and my personal taste.
Scaled the files x10 in slic3r before printing.