Convert to Sheet Metal without bend edges refused every plate whose bounding-box diagonal reached a thousand times its thickness ("no outline on that face"), and just under that limit a hole smaller than the mesh's sag fell out of the outline and the DXF. The outline's tolerance is now at most a tenth of the thickness: a thin plate is meshed again at that tolerance. Nothing new is stored. Tests: long thin strips, sheets thousands of times longer than thick, and a strip keeping holes down to 1 mm.