How not to loose precision when exporting to dxf?

When a simple line drawing of exactly 1780.00mm wide is exported into a new dxf file and that file is imported back into illustrator CS4 the precision of the imported drawing is not the same. Often about 0.2 mm smaller.Tried other units, did't work. Snap to grid/point was switched off. I need the exact size again..
I hope somebody can help?! Many thanks.

Niffo,
Of course I understand the importance of accuracy, especially if the design will be transfered to physical fabrication. But what I'm suggeting is that you aren't losing "image size," but rather losing "line weight" or at least its reference. As a result, you may be seeing a different dimension. Consider this oversimplifcation:
Dimension A = the distance between the lines.
Dimension B = the distance between the line weights at their outer extents.
Could it be that the dimensions of your drawing are being measured at different points pre-dxf export and post-dxf import?
I don't know, but this is the possibility I was presenting in my previous post.

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