I am pretty new to Shapeways, so I have never printed in the Fine Detail Plastic before. I am designing a train car kit where the sides, roof, and floor are separate components. If I lay the sides flat with the exterior facing up, how smooth will that flat surface be? I understand that there will be extrusion/print lines on vertical and curved surfaces, but what do horizontal surfaces look like? I have done some prints with traditional extrusion head printers, which gave kind of a crosshatch pattern as the nozzle moved along the X and Y axis. I am trying to learn about the Shapeways resin-based printers and their capabilities. Does the resin cure in uniform sheets, building up the model, or does a point (like an extrusion nozzle) move around and fill in the profiles/layers? If I need to sand anything smooth, I want to know how much surface detail I will need to build back up post-sanding and if it is worth adding to the model in the first place.