Hello, I just believe I needed a good night. You were right, pbacot, it was a layer issue. Problem solved! Thanks for your advises.

remontez dans le camion! y'a pas de camion chef ! descendez du camion...

Don't know what I missed. I recreated the dp_cdrh component and everything works fine, now... I attached the file if you want to check out. Door and frame, fixed

@maxevron said: @dave r said: As you can see, I have two other quarters of a disc to create (radius : 5 cm). This will be a good exercise. Well, I managed to create my quarter discs a few days ago. In fact, I made a huge trigonometry mistake. I created a circle made of 36 segments in order to have a quarter disc made of 9. I don't know why but I imagined the angle between each segment was 9° instead of 10°. So rotating my circle 4.5° (9/2) created a segment not perpendicular to the polygon I wanted to extrude. Rotated 5° fixed my problem. Many thanks all for your precious help.