Hi Brendan it would probably help if you could also post the 3DM model file with your grid lines and object in it.
One thing that you're probably running into is a difference in scale when you export the objects individually like that. When you export from a perspective view, the 2D final result will be scaled to fit within the PDF printed page boundaries. Probably your grid lines are much larger in size than your object, and so there's a large difference between them when they are each individually fit to the same end 2D printed page space.
But you can export a mix of solids and curves with the PDF export, try exporting your grid and your object all together in one single export instead of individually. You might need to cut off your grid some more and not have it extend too far around the object.
- Michael
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