>>7497222I mean, you can sand and hit it with the finishing materials out there. Sanding + (optionally) epoxy coating seems to be the process for PLA, and ABS you use acetone vapor I think? Pic related, PLA finished with epoxy.
I've ordered resin prints from shapeways before for toy stuff, and I always felt like I couldn't get rid of their natural finish, whicj felt like... Sandy? Fuzzy? Not sure what word to use. But no matter how much I sanded they still were fuzzy.