So I figured I would share what I can as I prep the 3D prints for molding & casting.
Below is a pic of how one of my sprues comes back from 3D printing:
It's an off white material that is hard to see any detail on. I applied a light coat of primer and this is the result:
Here's close up showing the build lines. Those lines are the actual layers of material, each as thin as 16 microns:
I'm waiting for my tiny tools to arrive in the mail and then I'll try sanding them. I might wait and make a cast in resin and sand that, as resin is easier to work with than the hard 3D print material.