There is a video on aligning the Z towers here: https://www.youtube.com/watch?v=CNWzMLc5...
Loosen the bolts in the Z brackets for one tower, so it can move freely.
Lower the Z yoke by spinning the lead screw, until the yoke is just above the leadscrew coupler.
Tighten down the lower Z bracket, be sure the Z extrusion is pushed flush against the side extrusions as you tighten the brackets.
Move the yoke into the center of the Z tower.
Use a calipers or a ruler to measure from your front panel to the Z extrusion at the bottom.
Repeat the same measurement near the top of the Z tower, and adjust until it's equal.
Tighten the top of the Z tower. Repeat for all 3 towers.
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