I think it's in the scene outside the Baxter building before JR meets Pris but I could be wrong. I think it looks great and it woulda been perfect for fans of the movie who like obscure items.
Usually you have to do some very fine sanding as since it's grown with sand it can be rough but it seems to be getting better and better where you don't have to sand it unless you want to.
A look at youtube will clarify on this as there is NO sand(as you call it) involved with SLA. Sounds like you are thinking of an older form of 3D printer. I know what you speak of and yes, the finished parts resemble a sand castle. They were top notch 6 years ago but look very poor considering what is out there now.