A couple thoughts that may help if you hadn’t tried them. Make the edges 1 or 2 pixels thicker in the Tech mode than the hidden lines. I also think the PDF995 driver makes a better PDF with a high dpi in the ‘advanced’ quality options for it. testtech.pdf (80.9 KB)
On a small model it wouldn’t be painful to duplicate the edges for hidden lines and then use linetypes for the dot control in a Wireframe detail. If you can do that I’d probably also use Neon with shading off since the AA is superb.
Well, tech modes already knows it if is hidden or visible, so let’s hope it is an easy fix. The different line width is a good workaround for the time being.