If you upload the model we’ll have a better chance of determining the problem and its solution. You may omit some necessary detail from your description simply because you didn’t know it was relevant.
first , thank you Gully and Box for taking some of your valuable time trying to help
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Box: The brewing vessel is for a 1/120 scale model railroad layout so It is already scaled up by a factor of 1000. so should I scale it by a factor of 100 before using the outer shell tool or should I restart everything from zero and recreate the 2 objects with a scaling factor of 100000 ?
Gully, could you please indicate the link about how to upload a model ?
Yesterday was my 1st post so I was allowed only 1 picture.
Now is the picture before I run the Outer Shell tool and everything looks OK
In principle I would model everything to full scale, even if the ultimate goal is to create a scale model.
To me the problem seems to be the insane amount of geometry you are using to model something that in the end will be a tiny detail. If the model is going to be 3D printed to 1/120 scale the print will still be much more coarse and if you used the standard 24 segment circles instead of a zillion there would be no difference in the final output.