Thanks a lot, this is very helpful. I didn't know how to test if my stl was ok and didn't think of looking for an analyser online.
Now I guess I have to sign up onto the FreeCad forum 😛
Do I have to like edit the topic name to put [solved] or anything ?
"it's a different problem depending on the orientation"
That is always an excellent indicator that the problem is in the model. I uploaded it to formware.co/OnlineStlRepair and here is the report from there.
-> Analyzed your file:
--> 46 Naked edges (?)
--> 0 Planar holes (?)
--> 1 Non-planar holes (?)
--> 100 Non-manifold edges (?)
--> 51 Inverted faces (?)
--> 0 Degenerate faces (?)
--> 40 Duplicate faces (?)
--> 0 Disjoint shells (?)
-> Repairing: 100.00%
----- Repair completed in 1008ms ------
-> Vertex count changed from 2529 to 1356 (-1173)
-> Triangle count changed from 5120 to 2708 (-2412)
Was the model supposed to be a tube? The repaired model is not and the surface created mid-tube is on an angle that seems to have something to do with the helix angle of the threads. I think this one needs to be repaired in the CAD software.
Your uploaded model is on the right and this is in Cura's Preview "X-Ray" view. The red areas indicate model problems.
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