Export Layers in Publish Tool

Select and configure in the settings menu the layers for the DXF. In this case the contour lines will be white, feature lines (on front side) will be red and the unconsumed sketch lines will be yellow.

The hole chamfer is a feature as well and will be exported as a red (etch) line. A solution is to use this etch line as marker for the chamfer depth. (image 1)

Store the layer settings in the iProperties and in an assembly this part will always export feature lines. (image 2)

Select the values you want on the DXF and choose etch layer name and color. (image 3)

Image 4 is the result of the exported DXF.