problem with extrusion

 From:  Raoul
5733.9 In reply to 5733.8 
BurrMan, you are right. Although I thought the curves were 100 % upon a XY planar surface, it is not exactly.

I projected the curves to a new XY-planar and used that new projection for extrusion. Now the whole problem is solved.

Thanks all for your help!

Raoul