Hi Everyone.

Everytime i want to use fillet, i run into somekind of problem with it.
Can someone explain to me why i get these problems.








The fillet sort of goes inverted in the original shape or the surfaces disappear???
Depending on the size i pick the fillet works.
But when i go bigger or smaller i get these type of things as shown in the pictures.

I attached the file.

Below is what i want to fillet.
If someone can explain to me what i did wrong or how i can prevent this from happening i'll be very gratefull.
Thanks in advance!

Glenn