Specifically, I'm looking for information on FlexSim 7.1, 7.3, and 7.5.
FlexSim uses the Open Design Alliance library for importing AutoCAD's proprietary formats. The best information I can find on what versions are supported comes from this document.
"The Open Design Specification for .dwg files serves AutoCAD’s undocumented and proprietary DWG file format. This specification includes DWG file format versions 13 up to and including version 2013."
So any .dwg version from AutoCAD version 13 (1994) through 2013 should be compatible for importing into FlexSim (see this article regarding AutoCAD's version history).
AutoDesk's knowledge base indicates that any version of AutoCAD can save as an older version, so if there is incompatibility with a drawing saved in a newer AutoCAD version, you can save your drawing to an older .dwg standard by exporting from within AutoCAD itself.
Please see FlexSim's user manual (Help > User Manual) under the topic "3D Media/Importing AutoCAD Drawings" for considerations on optimizing your drawing files for use within FlexSim.
AutoDesk's knowledge base indicates that any version of AutoCAD can save as an older version..."
This quote (and AutoDesk link) from the original answer may no longer be true.
We recently had an issue trying to load an AutoCAD 2018 file into FlexSim. First we needed to save this file to an older format, such as AutoCAD 2013. However, when we attempted it we received this warning message:
If you see this error message when trying to save your AutoCAD drawing to an older file format, please try the suggestions found here:
https://forums.autodesk.com/t5/autocad-forum/saving-as-autocad-only-objects/td-p/3729208
We have had some success in getting the resulting files loaded into FlexSim.
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