I modeled this knot for a class last month, and it was a challenging problem. The part is based on a boundary feature which is patterned three times about the z-axis. I adjusted the tangent length on the first and last profiles of the boundary in order to approximate the curvature of the knot. I set the the material to silver for a sleek appearance. Enjoy!
Worcester Polytechnic Institute
Mechanical Engineering, 2013