Hi Michael,

I completely agree with you.

My original solid was built the way you suggest, using Boolian operations to cut this solid out of a cube.

Only after running into problems with Shell and/or Fillet I was 'crying' for help.

But now my problem has been solved by following your explanations/suggestions: I was able to produce a 'clean' shell.

Thanks & regards
Jurgen

p.s. your 'realtime' replies are 'breathtaking'.
The next time I will probably get an answer before I hit "Post" ;-)
Thank you again for the excellent support you provide!!