Most of what I 3D print are masters that, once cleaned up, will be molded in silicone for duplication in resin.
What would be really great is a material that sands and smooths easily. The WSF really takes some work to smooth out any printing texture. The polishing option does help but it would be great to have a something softer. Flexibility isn't a consideration for me.
Have you tried spraying a clear coat over the item? Should be easier than sanding and help with molding. With WSF it will take several coats as the material is very porous. Your friendly neighborhood Moderman