Hi all, I'm new to the world of 3D modelling and am trying to find my feet. (I'm also trying to find a 3D software that I like!) My main problem at the moment is when I create extruded shapes from flat planes. Are those extruded shapes, by default, hollow? I'm planning to print in stainless steel and know I need a wall thickness of at least 3mm, but it appears that the extruded shapes' walls are only a sliver thick. How can I change this? At the moment I'm flirting with 3DVIA, Blender, SketchUp, Alibre and Rhino. So anyone who knows how to do it in any of those programs, please help a girl out! Thank you!