Plurrie Ender 3 V2 Z-axis homing VERY inconsistent Help Hi all, First time posting here, so hopefully I'm doing this right. My new stock Ender 3 V2 is having extreme deviations in Z-axis homing. When I auto-home, The nozzle will end up anywhere between perfect print height to a full millimeter off the bed, seemingly randomly. 3 - Adjust the Z-axis limiter switch. On your Ender 3, Ender 3 V2, and Ender 3 Pro, you'll see two M5 bolts with two M5 t-nuts. Carefully loosen each bolt just enough to slide the Z-axis limiter up or down the 2040 aluminum frame. You'll likely only need to move the Z-axis limiter switch up 1 or 2 mm to correct your issue. The z-axis motor is not bound and is moving in both directions, just not after homing. I am also assuming the z-axis is supposed to be able to move down after homing, as the instruction for setting up the CRTouch specifically says to home the head, then to find the z-offset by lowering the z-axis. If the stepper is driving the printer head away from the endstop on a particular axis on homing (in your case the X direction), there might be a few possible problems at hand: The stepper cables are plugged in reversed; The wires in the stepper cable are switched It does not move at all on the Z-axis and remains 3 - 4" above the bed during and after Auto Homing. Here's the detail : I installed a Creality Ender 3 Pro New Upgrade Motherboard Silent Mainboard V4.2.7 with TMC2225 Driver Marlin 2.0.1 & bootloader pre-installed & then a Creality BLTouch 3D Printer Upgraded Auto Bed Leveling Sensor Kit (the I've managed to loosen the wires from the terminal and place them in a correct way using a flat screwdriver that came with the other Ender 3 tools. After switching wires to correct position the z axis started to autohome correctly and z stop switch started working correctly. If the Z-axis does not move at all after the XY-axis finishes homing, it indicates that the Z-axis motor is not rotating. 2. Cause analysis Motor wires are not connected properly. 3. Troubleshooting and solution 3.1 Reconnect the motor cable of the malfunctioning axis. (The motherboard end also needs to be reconnected.) Specifically, the Z-Axis no longer moves down (the X and Y axis seems to be fine). Not only will it not Auto-home, but going to "Move axis" in the Prepare menu will also not move the Z-Axis down. I have attached a video I found on YouTube that showcases basically the exact same problem I am having. In the case of only the Z-axis of your Ender 3 failing to home, we can immediately tell that the Z-axis endstop is the culprit, meaning that either there are problems with its wiring (especially likely if you have been working on your Ender 3 lately) or the endstop switch is not functional anymore. be able to measure the Z axis to finish homing, in other words, after checking the x y axis, the Z axis goes up a little, bltouch test rod lowers, Z axis goes down until it touches the table, bl touch detects the contact, Z axis goes up a little, Z axis goes down a little, BL touch detects the touch again, and ends homing 3.1.3. Printer rpjd5p.