Hi @giuseppecfgeo​, you might need to check that you have the elevation set on the incoming points as the Z value. You can check this in the Feature Information Window of the Visual Previewer or Data Inspector to see if the elevation (z value) is already set. And if it isn't, you can add a 3DForcer somewhere before the DWG writer to set the Elevation to the elevation attribute. This should allow you to write out a Z position value.