I need to design a solid body of what is shown here (I did this using Mathematica).

I can only save it as an .STL or .IGES and when I try to import it into SW, it generates lots of faces which is undesired. Any help is much appreciated.

Imported as an STL. Zoomed view, undesired small surfaces.

Hello Keshawa,... unfortunately... not easy.. you would need to convert to a nurbs patch/quilt (quads mesh/subdivision)..

Was this the site you got the equation...?

Triply Periodic Minimal Surfaces