You have attached sketches to faces which vanished due to some internal reordering over which you have no control. See the documentation about the topological naming problem. Have a look at this page how to avoid it, especially the paragraph about creating stable models.

... Am I doing something stupid or is this a bug? This is FreeCAD's dreaded topological naming issue. There is a simple solution in this case: create an additional LCS, set the rotation ...

... geschenkt. Ist folgende Vorgehensweise für deinen Vorschlag richtig (topological naming problem vermeiden): - Unter "Model"->"Bezeichnung & Eigenschaften" ist nichts ausgewählt. ...

... benötigen. Ist folgende Vorgehensweise für deinen Vorschlag richtig (topological naming problem vermeiden): - Unter "Model"->"Bezeichnung & Eigenschaften" ist nichts ausgewählt. ...

... dass Du das Sketch auf eine berechnete Fläche gelegt hast. Das sog. topological naming problem kann dann nämlich leichter das Modell zerschießen. Sicherer wäre es - und dann ...

noch ein vorschlag antonauntriplaoutbo :-) (anti topological naming universal triangle plane out of the box für part-design part sketcher arch/draft mesh und point) ...

Rhinokeegan wrote: ↑

Sun Jan 17, 2021 3:09 pm

Attaching sketches to faces is the way I learned F360, so maybe I need to learn a new method.

Read about topological naming problem.

... faces, the origin seems to be somewhat arbitrary, probably due to the topological naming problem . So it is better to attach only to the main planes and sketches, but that is ...

... should check if the fillets are still where they are supposed to be ( topological naming problem ).

... faces, the origin seems to be somewhat arbitrary, probably due to the topological naming problem . So it is better to attach only to the main planes and sketches, but that is ...