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. The Mad Moder