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Live adjust Z

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Every FFF (Fused Filament Fabrication) printer requires a First Layer Calibration, which sets the vertical "Z" distance between the nozzle and the print surface. Sometimes this value needs a slight adjustment and for this situation, there is an option called "Live adjust Z" (as you are mostly tuning it live during the first layers of your print). The reason for adjusting the distance is to provide better adhesion of the extruded filament.

How does it work?

It is important to know the following:

  • the default value before the First layer calibration starts at zero (0.000) for all printers
  • to get closer to the print surface, turn the knob counter-clockwise and further increase the negative value (e.g. -0.500 => -0.600 => -0.700...)
  • to get further from the print surface, turn the knob clockwise and continue lowering the negative value (e.g. -0.700 => -0.600 => -0.500...)

The values of the Live adjust Z are typically in the range of -1.500 to -0.200. Going above zero into the positive values is not possible, this indicates either an issue with the measuring sensor (M.I.N.D.A., P.I.N.D.A., SuperPINDA) or incorrect alignment.

The correctly assembled print head has the sensor always slightly above the nozzle, never at an equal level or below the nozzle (see the picture below). The exact position can slightly vary, use the last chapter of the assembly manual of your printer to set the rough distance.

Example of the MK3S extruder

Live Adjust Z (while printing)

The most common approach is to perform the Live Adjust Z during the print. Go to LCD Menu -> Live adjust Z. This will show the Live adjust Z value you have set in the First layer calibration. From here you can adjust it by rotating the knob.

Example of the MK3S menu

PRO tip: shortcut from the main screen, while printing the first few layers press and hold the knob for a few seconds to access the Live adjust Z screen.
Adjusting Live adjust Z value while printing is permanent, not only for the ongoing print! The new value will also remain after you turn OFF the printer.
In the picture below you can see examples of different Live adjust Z values. If the nozzle is too high from the surface, the filament won't stick properly (left), if the nozzle is too close to the surface, the filament won't be able to "flow out" leading to a potential clog of the nozzle (right).

Live Adjust Z (before the print)

You can also change the value while the printer is at rest from LCDMenu -> Settings -> Live adjust Z. You will see the value set previously during the First layer calibration, and from here you can adjust it by rotating the knob.

Example of the MK3S menu

The Live adjust Z should be used only to fine-tune the distance. For example, PETG and other high-temperature materials require to be squished in the surface slightly more as they tend to warp (lift up), compared to the PLA. If you have replaced the sensor or disassembled the print head (extruder) you should run the First Layer Calibration (i3) instead.

Live Adjust Z (LoadCell)

The Original Prusa MK4, MK3.9  and the Original Prusa XL are equipped with a LoadCell, which will calibrate the first layer automatically. In case you would still like to fine-tune it, you can long-press the knob while the first layer is printed. The Live Adjust Z will not be saved for the next print in this case.

In case you have constant issues with the first layer on a Prusa printer with the Loacell, check the guide First layer issues.

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