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If you look at this guide (https://github.com/skellatore/anycubic-predator) it tells you what to do. You can adjust the X,Y and Z carriages in place (that is what the wrench is for, that came with printer). One side of each carriage has no adjuster while the other side has a hex nut you can adjust that can be accessed between carriage and tower while on machine (see attached photo). I would recommend taking belt tensioner off to check each carriage free of the motor, and adjust each carriage so that they can free fall in each tower but not have any slop in them. Adjuster is a cam effect, depending on which side of the lobe your on will determine which way is tighter or more loose, just turn a bit and check if it got tight or loose.