I wrote a Macro for inventor that flat patterns all sheetmetal parts and exports them to dxf and dwg. I posted it on my account and would like if some inventor users can try it out and give me some feedback on it.
I was working on Sheet Metal DXF Exporter from Micrographics, and it works fine. For few money you'll have a good configurable add for your Inventor. Now I'm working on Solidworks and I haven't found noting like it.
This might also be useful for the sheet metal folks out there. I wrote an iLogic utility that exports out a sheet metal BoM. So if you have a model that contains sheet metal and normal parts, this will just send out the sheet metal components: https://clintbrown.co.uk/2020/03/01/ilogic-export-sheet-metal-bom/ You could use this as a check list to make sure that your DXF's have all been exported.