The built-in plugin "another DXF import" causes the layer Elevation or z-valuer to be lost.
This plugin simply extracts the layer from the dxf file with elevation or z-value maintained and converts to the shape file.
It needs some modules installed.
exdxf_v0.9 (https://pypi.org/project/ezdxf),
pyshp_v2.10 (https://pypi.org/project/pyshp)
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