Having what I think is a regression for an issue I had reported last year (YT is **RH-64635 - Brep in Clipped Blocks Not Printing Edge Thickness). Over the last few service releases I have been have been seeing this issue reoccur and now after the most recent SR18 the problem has returned full force.
Sometimes blocked objects that are being cut with a clipping plan do not show edges. I have attached two example screenshots. “Test Page 1” shows the issue, “Test Page 2” shows printing functioning correctly. The issue is visible within a detail view in paper space and when a clipping plane is assigned to that detail view. When I notice the problem occurring I simply activate the detail view by double clicking inside it, then deactivate it by double clicking outside of it and presto! the polysurface edges return. Unfortunately when you have a huge drawing file with loads of detail views on many different layout pages it is hard to catch them all so in order to print a clean drawing set it often takes many many attempts. Its hard to recreate the problem on demand as I have not been able to identify a procedure to reproduce it…
I was unable to duplicate this issue with your model and my Shaded display mode
and Rhino 7 SR19 2022-4-26 internal build.
Also I tested with the Rhino PDF or FoxIt PDF printers. (What PDF printer are you using? )
However I am able to duplicate this in Rhino 8 WIP. That is logged as RH-68445.
Could you send me your Shaded ini that you are using in the Detail?
I will test and see if it is related to a setting in your custom display mode.
Also set your viewport to Shaded that has been returned to defaults.
Does the print issue still occur?