Hi everyone, I just received my first 3d printed model and there are some issues which i could use some help with. I have 2 questions - How do i get Shapeways to recognize hollow areas - it seems as though they were ignored completely and filled solid with print material. In 3DSMAX i created the hollow using a Boolean subtraction rather than Shell, was this a mistake? Also, has anyone attempted to create small tubes using FUD and what are the smallest tubes physically possible? I need tubes that are as small as FUD will allow and they need to be functional -they will transport liquid within them. The tubes from the model i received today were fused solid, although it seems the 3d printer did at least make an attempt at them . Thanks in advance folks, Paul.