A1 Suspecting X belt poorly tensioned

Hi there, i did not have any warnings for bad tension, but after manually disassembling and adjusting Y axis to rid of belt slipping, and even skew calibration, i noticed all my models are printing 100% size along Y axis, so Y tension and steps are exact up to 0.01mm but for X axis it gives stable 0,3% error, (bad tramming also performed, twice)

So everything i print is shorter along X axis, and has 99,7% of its intened length, so on big scale it is almost 1mm of shrinkage on 256mm size

i tried adjusting model in slicer by 0.3%, so model became 100x100mm → 100,3x100mm and it pritns as almost perfect square up to 0.01mm

All of that led me to thought - probably X belt not tensioned right, or even not stretched properly, so that scalable error persists, but believe me, i did X axis retension routine more than 3 times, X tensioner spring just cannot stretch it more. Also worth to add - initially x belt seemed to be missaligned, as in this reddit post, but i managed to allign it without disassembly so now it is more or less parallel with x rail.

https://www.reddit.com/r/BambuLab/comments/1f8z9bx/a1_misaligned_xaxis_belt/

So my question, is there an option to make my prints exact size as intened - to be 100% and not 99.7% ?

Now i know it is normal.. ok then, just stick with M290.2 parameter

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