If the nozzle reaches the bed before this, raise the Limit switch more. Rotate the Z rod until you hear the Limit Switch click.Once the Limit Switch is at the desired height, tighten the screws.(If you need to lower it, you may need to cut off the little plastic Stopping mechanism).

Slide the Limit Switch up or down depending on what you need.

Using the included Allen key, loosen the two screws on the Limit Switch Plate.

Start by loosening up the bed leveling knobs about halfway, don’t loosen them up too much.

Disconnect the printer from the power outlet.

The Limit Switch might be slightly too high or too low, so some adjustment may be needed. The Ender 3 (Pro and V2 as well) comes with a Limit Switch that is strategically placed along each axis, and they’re used to prevent the machine from overextending and causing damage to the print bed and other components. When materials increase in temperature they expand, and this is exactly what happens to the bed when you head it up, which means that if you calibrate the Z offset, or if you level the bed while it’s cold, as soon as it heats up for printing it will expand and move closer to the nozzle, which will mess with your settings. Let’s go over how to calibrate the Z offset in four different ways, two of which are not just the most effective ones, but also the easiest. If, for instance, you want to print on a glass sheet, you will more than likely have to adjust the offset since the thickness of the glass may not allow you to lower the bed enough to where you can get the nozzle to be at the right distance from it, and it will end up digging into the glass. There are many reasons to calibrate the Z offset on an Ender 3, such as leveling the bed properly, adding a glass sheet to the bed, printing more complicated models, and even printing on top of another object. Like with any good 3D printed part, it all starts with the first layer Get that one right and your print will more than likely come out looking great, get it wrong and it might detach from the build plate and create loads of issues. The most common reasons for adjusting the Z offset are to allow for the addition of a glass or thick bed material, and to fine tune the first layer for the best printing quality possible.

Z offset is the distance between the hot end and the Z home position on 3D printers. Check out our recommended products section What is a Z Offset?.Recommendation: Install an Auto Bed Leveling sensor (BLTouch).Calibrate directly from the Ender 3 display (Firmware).

Blender ender 3