Hi mvx. Yes I agree, you will need the holes and the hex head capture geometry there. When you place the part to print on the bed as I did add your 10mm outside-only brim and enable tree support to the bed only for the overhangs on those holes. That should do the trick.
That’s just your opinion. …and you are not wrong! and neither am I. This is my opinion, and everyone is entitled to their own opinion, and all opinions are valid. You should not judge me for my opinion.
Anyway it’s off topic. If you can add to the discussion here then you are most welcome
Cheers
Thanks again Stedyone01 , I’ll give that ago later and see where I get to.
[edit] I just notice that you printed the bracket with the face in the bed. I did mine on the side, so this is super strong
In the meantime I tried printing a handle for a Hex drive chuck, but got another substandard print 
It prints OK at the bottom, but near the top it’s so bad it has holes in it . Not sure that comes across in the picture.
Wellco
@Mvxim have you been here yet:
https://wiki.bambulab.com/en/knowledge-sharing/common-print-quality-problem
Yes I do sympathise; this is similar to the issues that I have. I’m pretty much sticking to the default profiles and only using BBL filament.
The reason I purchased a P1S was so that printing would be reliable and quality without the need for tinkering.
I might try calibration, but I really thought that a BBL printer pretty much negates the need for this. I want to make things not spend time nursing the printer…
No I haven’t been there, that a good catch. Thanks.
I’ve had a bad hangover, but never had a bad overhang 
Are the 20 stupid steps written somewhere so i can get them done?
You can start with the forum Read Me which explains it.
https://forum.bambulab.com/t/welcome-to-bambu-lab-forum-read-me/