oookaaaay...
Did someone say "frustration"? 🙄
I played a bit as suggested by Gene with the parameters of the editing function (I have the menu in Italian, I suspect that this also generates confusion, I have to change it to English) and obtained a clearer picture:
the points of the image as they are are objectively many, around 400
so, always following the suggestions received, I tried to simplify with the dedicated command. better, definitely.
then I watched some tutorials on how to join the separate lines of the design, finding two systems: select all the parts of the design and use the "weld" (salda, in Italian) function or zoom in and join the individual points two at a time.
and here I am stuck: I can't connect the various parts of the drawing.
furthermore, having done this, I would like to modify the lines trying to make the curves of the spiral more fluid: zooming in you can see that the curve is not homogeneous but full of jumps which I imagine create confusion for the plotter during the cutting phase.
I continue to bombard the keyboard with commands that prove useless, waiting for help.
I continue also to ask myself how it is possible that there is not (or that I cannot find) an exhaustive manual of this new to me discipline, since the last century I have been accustomed to reading a manual and applying its indications, not to trying things out... to say that It's frustrating, it's not much!
TIA, Paolo