You are being a bit stubborn to people trying to help and explain things to you, and for seemingly no good reason. When more people respond in kind, you basically state you no longer have time to deal with it because you’re not getting the response you thought you would get or wanted to hear.
Please don’t do that. Be humble, admit you don’t know everything, or maybe at least that you don’t know everything you thought you knew. This is how we learn things, and sometimes, relearn things due to our own misconceptions. Everyone here is literally trying to help you.
The base issue here is that you are expecting dimensional accuracy in the thousandths of an inch from technology that is not made for that purpose.
I too have been 3D printing for a long time, almost 10 years since I got my first MakerBot. Among other things am a mechanical engineer as well as a master machinist. I deal with all types of manufacture and fabrication every single day. I run 3d Printers, FDM, SLA, and SLS, CNC routers, lathes and mills, plasma cutters, and Laser Cutter/engravers.
Plainly put, FDM technology has too many variables to consistently get such tight tolerances. Even if you dialed it in perfectly this afternoon, you may get different results due to ambient temperature or humidity tomorrow morning. Change the filament, nozzle temp, bed temp, speed, etc… you would have to recalibrate every time. Your just chasing a ghost that is impossible to catch.
If your trying to fabricate something where the tolerances are that crucial, you should not be doing it on an FDM printer.
As someone already mentioned, it’s more about knowing how to design for 3D printing, as the printer just will not produce your design down to the micrometer.
If you need a part to be that exact, then something like a CNC manufacturing is the way to go. However, there are also variables to this as well. Machine a piece of aluminum to spec, then measure it outside in 98 degree heat and it will be larger. Aluminum will expand up to .024mm per meter for every 1 degree Celsius of temperature increase. So when designing parts we accommodate for this by designing for it, the same way you need to design for FDM printing.
Try to keep an open mind, be thankful there are such great online resources, forums, and people to learn from. I’ll be fifty this month and I am still learning every day, and you can learn something new from everyone.