Hi Pilou, the way it works is you select curves, then run the command and enter in a distance value. Any curve control points that are within that distance of their neighboring points will be marked with a point object.

If there are no such points then it is normal that you would not get any output.

For a demo, load the .3dm file attached to the first message of this thread, select the curves and run the command and put in a distance value of 1. There will be points marking areas that have curve control points that are 1mm or closer to their neighbors. Those are areas that would be good to investigate for problems.

- Michael