A tip from Andy Proverbs
   
   
For anyone plotting large 3D models in AutoCAD who finds some of the lines missing.

   
set ' Hideprecision' to 1
This will ensure all the lines are plotted, but be warned, it will take longer to hide and plot.
   

This "setvar" is not saved, so every time you final plot a large drawing you will need to set hideprecision to 1.