I make weapons and accessories for action figures. I do it mostly as a hobby and keep my markup low.
I offer stuff in WSF, BSF, and MetalicSF for the most part because of how tough it is, also it accepts simple water based acrylic paint very well. I don't offer polished too much because the items loose a bit of detail, and I've had odd results, over-size items like the Giant Hammer come out fine polished though.
I've test printed everything before offering it up for sale, but sometimes older items cant keep up with newer print standards and are removed.