Make Holes for Screwheads

Hello Guys
I’m new to blender and am mainly using it to create models for 3D printing.
In the Picture below, you can sie my latest project. i created a hole to fit a screw. Now i would like to make the upper 4mm part of tho hole slightly bigger tho fit the head of the screw inside.

I tried out some stuff but only came up with the idea of making a loopcut and scale the selected part. But i don’t want it to affect the lower part of the hole.
I hope i unterstand what i mean

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one way would be to add a edge loop inside the hole
then select the top loop and scale it

another way select top loop and add a bevel with Ctrl-B

happy bl


Thank you very much, that helps a lot!

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