This is a slight optimization in order to make the characteristic bending easier to distinguish.

I mirrored the pattern and placed them in close proximity.
Distance between two mirrored patterns can be adjusted in the SCAD script via mirror_spacing.

For this backlash calibration methode, we are searching for the pattern right before the first opening "eye" (see also summary of initial version).

Connected strings cound +0.01mm for every segment (+0 to +0.09).
Each column is +0.1mm for every column (0.1 to 0.9).
Backlash is the sum of both, e.g. 0.06 + 0.3 = 0.36mm backlash.

Maximum adjusted backlash with this pattern is 0.99mm.
If your backlash is higher, you can easily adjust the Backlashstartvalue in the SCAD script.

I will provide a customizable gcode file for this as well but I have to test this first a bit more.