i3 Z axis dial indicator calibration post
thingiverse
I've noticed others leveling their Z axis by measuring from the bed, but that approach seems flawed since the bed itself is a movable component. It's more practical to level the Z axis by measuring from the frame. This straightforward object fits between the bed and the towers, serving as a post in this configuration. You attach a dial indicator to the X axis rods and position it beneath this post. Next, measure the height directly under the X stepper motor side, then repeat the process on the idler side, ensuring both measurements align perfectly.
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