QGIS: exporting contours to DXF with height values

Question

I am using this video tutorial to create ground contours for a noise model in iNoise.
https://www.youtube.com/watch?v=JxCxBREEqG0
See tutorial 8 https://dgmrsoftware.com/products/inoise/gallery/
When I import the dxf file it has no height data.  Not sure where I'm going wrong as all the layers have height data when checked in QGIS.
It seems I loose it when exporting as a dxf.
This question may indicate that dxf has no height values but is drawn to height.  Not sure.
Exporting QGIS contour attributes in DXF file?

TeddyTedTed · Answer

Try using the Set Z value tool in Processing Toolbox > Vector geomoetry instead of Grass.
Use the icon to the right of the Z Value input and click Edit to add an expression. For the expression just write "ELEV".
Then when you are exporting the layer to DXF make sure the Include z-dimension box is checked, if it isn't then set the Geometry type to LineString and then check the box.

QGIS: exporting contours to DXF with height values

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