The STL file export from Chief Architect is not a 3D printer ready file. Too many holes in the meshes and is not watertight. Been this way since X6 when the feature was introduced. It would be nice to see some advancement for Chief Architect in this area.   This article is a bit dated, but useful in understanding the issue with 3D printing Chief STL files. http://www.studica.com/blog/chief-architect-export-printable-stl-file   There is also a free to use m
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