Unable to split a solid

 From:  Bob (PHOTON713)
4060.1 
Good Morning, all...

I have been using MOI to create prototypes for 3D printing and casting in ductile iron. This has been a successful process. However, the foundry has requested that I provide a split pattern for the patternmaker. This requires that I divide the prototype at the parting line. This is the equivalent of splitting a two layer cake into it's two separate layers. Has anyone experienced a similar problem with a solution?

Thanks...Bob