I have 6 hours into this thing at least...importing, exporting, fitting splines, trying everything I know and can find on the internet......I can not get this thing to thicken.  I have hundreds of parts to do, so I think I am just not getting it.  We do not need much detail, I am fine deleting surfaces, radiuses, small geometry etc...  as long as the overall size and shape is maintained, thats all I need.  I know that the surface has open edges (indicated by the blue lines).  however I do not know how to quickly clean them up so that it will thicken into a solid.  I dont even care how thick, 2mm or .002mm........just need a solid.  Anyone have any pointers?  What am I missing, this cant be that difficult is it?