Hi, I am very new to 3D prototyping. Unfortunately, I am starting with a quite complex model (got no other choice). I have lots of questions. My model is a network structure; geometry is composed of very simple elements, that is nodes (spheres) and rods (extrusions of circles). What varies is the orientation of these elements in space. I model in vectorworks, that exports to STL. I tried many times to upload to shapeways, but had no luck. Since all elements of the structure remained separated, I thought that making a boolean union of the whole would be a good thing. I mean, joining solids avoids non-manifold geometry, correct? I only partially succeeded because I ended up with three solids. Vectorworks refuses to join those three. Can someone suggest another software to make the union? Also, when I export to STL and check in netfabb, I don't get only three shells, as I expected. I get MANY MANY of them... how is that explained?