Thank you for the response.
Yes, proprietary, despite being super simple. I deleted objects off the layers and left them in the on and off state corresponding to my last printing attempts.
If I have an aesthetic goal in mind, with Rhino I need to organize lots of combinations of objects in order to get them to print like I want (curves vs edges, draw order, disappearing text, print preview turns itself on and off, remembering to reset buried print dialog options every session, model vs layouts, Rhino color settings for “background”, what you see is just not what you get, sorry). Best method to staying organized is layers. Printing in Rhino is still a fragile process and it takes what I consider to be a major time commitment just to manage. Sometimes 1-2 dozen test prints to get it looking right, even once. I’m not doing the Make2D dance to generate design options - been there, done that.
Kind of a shame that even truly flat shading surfaces doesn’t print to vector. Hatches it is, then.
Suppose I’ll hold out hope for R8 layouts and printing getting smoothed out? This was welcome.