Ah understood. Do not use the Sheetmetal Workbench. As nice as the features are, you will find that certain quirks of FreeCAD rear their heads to make the use of it impossible for a design that will be undergoing revisions. I suppose using git may be a good idea for keeping track of revisions.Oh of course! I actually didn't use the sheet metal workbench, I instead used the part design/part workbenches to flesh out the design That let me export the 3d Object as an STL file, so now I'm setting up a render scene in Blender and seeing how well everything lines up. The current iteration is meant to be laser cut so I really ought have used the drafting workbench. I do think that I would like the design better if it were sheet metal based.