Hi Andre, filleting doesn't like it when you have separate faces that are coplanar fragments of one larger plane. So try to get these areas to be one large plane instead of in pieces:
You can get that done on the front by deleting the 3 fragments and then selecting the main object that now has an opening in it and using Construct > Planar to fill in the opening with a trimmed plane.
It would also be good to combine the back side similarly but it's a little more difficult because they aren't coplanar. You could probably leave the bottom one on the back alone but the top one has 2 planes at a very shallow angle to one another, also something that filleting doesn't work well with.
- Michael
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