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How is the belt tensioner?
Belt tensioner i have only on Y axis because i have shor belt and now waiting for new belt.
In the first photo: it looks like you have experimenting some wooble in Z axis.
Try to print that (or something like this, searching ‘antiwooble’ at thingiverse): ANET A6 antiwobble by dmpush - Thingiverse 49
I think u have a Z wobble; your vertical threaded rods does not rotate around the vertical motor axis, not aligned. check the Z couplers.
check some unusual friction on Z mechanism (perhaps is not working smooth).
this is like a acrylic frame problem but try make this Anet A8 - X belt tensioner by Robchiks - Thingiverse 57 maybe need little update for A6
and use anti backlash nuts