Thanks for the reply and adjustments. I've got a lot to learn, but it seems trial and error is the best way. When I create an STL from your file, and from another project I was working on, I still get: i.e. 137 faces exported (number varies) 0 lines exported (all are showing 0) 400 objects ignored. (numbers vary) I guess my questions is- which of the 3 pieces of info is for information only, or are any of these 'error' messages I should be concerned with. (I don't have a 3D printer yet to try these out as far as printing compatibility.)