Flow calibration cube, print it with 0,45mm Extrusion width, vase mode, check the wall with caliper and adjust you flow rate.
You need 0,45 width, if your caliper show 0,43, make 0,45/0,43 (your value) = 1,05, so adjust your flow rate to this value.
Check my Bambulab collection tool :
https://makerworld.com/fr/u/3122702332/collections/188290
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