A Celtic Medallion

A medallion derived from http://www.thingiverse.com/thing:2245887- An Ornament Based on a Stone Carving. The sharp corners in the ornament were rounded and the ornament compressed to force additional cross overs. Six copies of the basic pattern were used instead of four which added more crossings. The medallion has 30 crossovers. It has a single closed path with alternate cross overs cross unders in the Celtic fashion. OpenSCAD code is included.