Så løste det derefter problemet, eller fungerer FreeCAD stadig ikke? It dident solve the problem, but it's like that it takes a few seconds longer before crash.(10sek after the freecad window opens) Ikke meget længere, tror jeg. Jeg er sikker på, at jeg læste et eller andet sted, at de har meddelt,...

Please don't spread your posts all over the place: https://forum.freecadweb.org/viewtopic.php?f=3&t=58029

Upgrade to 0.19 is probably easier than to keep the forum regulars busy, searching a solution for a two years old obsolete version, which is more than 8000 improvements behind. It is probably a so called coplanar issue, which can be avoided by slightly raising or lowering one of the middle spheres. ...

Did you check the Known OS specific issues?

Hier wäre mal ein Beispiel mit zwei MasterSketchen. Das Häuschen kommt ohne Gehrungen aus, daraus folgt dann eine 45°-Neigung für das Dach. Das Modell setzt auf externe Referenzen in den Sketchen, so dass die Teile zusammenpassen. An zwei Stellen habe ich Expressions genutzt. Beim Dachüberstand habe...

I wouldn't create this from surfaces, I would rather use a sweep, see e.g. Part Sweep.

I opened your file and it looks here the same as in your screenshot. OS: macOS 10.16 Word size of FreeCAD: 64-bit Version: 0.20.24720 (Git) Build type: Release Branch: master Hash: 8b0c58d1b45017ad42bf0fa8f827f1cf22a398e7 Python version: 3.9.2 Qt version: 5.12.9 Coin version: 4.0.0 OCC version: 7.5....

The developers are aware of this. Since years. The problems come from the third party geometric kernel. FreeCAD could indeed use the same kernel functions in Part and PartDesign, however, your case is an exception of the more frequent case that such sweeps work better in Part workbench, while the Pa...

Hi and welcome to the forum!

Thanks for introducing yourself with a contribution.

Sketche auf Flächen zu legen ist nicht empfehlenswert: schau mal auf den Abschnitt creating stable models.