The drawing is for: Cone piece on a cone (roof)

Instead of buying an unfolding program, we offer to draw and unfold special items. We can supply drawings in Autocad® 2D DWG files or in 3D as Autodesk Inventor® files.

In this example, there is a silo cone with two cones on it. All three topics are designed and unfolded in Autodesk Inventor.

If only the unfoldings were needed, the parts could be unfolded with PC Designer pc ++ Model "Cone on a cone". It will take approx. One minute from measurements are entered until unfolding parts are stored in DXF files and saved to the harddrive.
No CAD software would be needed.