Export to cad only a part of a Grasshopper project and using different layers.

Hi. I'll try to explain what I need, because I can't find a solution in the forum.

I need to export some geometries generated in a Grasshpeer project, actually curves. These curves are grouped by their position and some are for cut and others for engrave so have to be in different layers for the CNC process. Each group of curves have to be exported in one dxf archive.

TT Toolbox do it fine, but everything in the same layer, and is not possible to asign layers for cut curves and engrave curves (or I can't find the way to do it!). Other Python script I have see around exports all the geometries of the same type in the project (curves, points, etc) but I don't need all the curves of the project exported in the same file.

There are other solutions baking in to Rhino first, but I can't use them because again I don't want all the geometries in the project to be exported.

I hope someone can give a hand.

Thanks in advance!