Thank you all for your help!

Rotating the cylinder worked, as well as Michael's revolve solution. But I have a few additional questions:

1) How is it possible to revolve such a 90° arc-pipe ?!?

2) I do not understand the hint with ShrinkTrimmedSrf, how does this help me exactly? (Sorry I don't use MoI very often)

3) Where can I find a variable fillet?

btw I am using V3

Thanks!