Hi @illo76,

for the missing curves after `_Silhouette`

, you might check your model for naked edges using `_ShowEdges`

, bad surfaces using `_ExtractBadSrf`

and in areas where you get multiple curves, extract the surface and check if they have multiple knots using `_RemoveMultiknot`

.

You may check your document unit and angle tolerances too. If they are set too coarse, `_Silhouette`

sometimes makes problems. To go deeper you might provide the model for closer inspection.

Appart from all this, there is only the `_DraftAnglePoint`

command which might help to get the points which form the curve you search for. To find more about it, run the command and press F1

c.