Prusa Research Original Prusa i3 MK2S 1.75mm, User Manual

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6.3.9.4 Bed level correction ​ (kit only)
Bed level correction is an advanced feature that was introduced in the firmware 3.0.6 and it
is designed to allow advanced users to correct for the slightest imperfections in the first
layer. This feature can be found in
​ Calibration ​ - ​ Bed level correction. ​ For example if the
first layer seems to be ever so slightly more squished on the right side, you can virtually raise
the nozzle by
​ +20 ​ microns on the right side. Settings are available for Left, Right, Front and
Back. The limit is +-50 microns and even +-20 microns can make a huge difference. When
you are using this function, do small incremental changes. A negative value will act as
lowering the bed in the selected direction.
6.3.10 Fine-tuning the first layer
6.3.10.1 Print Prusa logo
After finishing the calibration gcode, it is a good idea to print a simple object. The Prusa logo
from the supplied SD card is a great example. The
​
Live adjust Z
​
function (described in
6.3.9. First layer calibration
​
) works during every print, so you can finetune at any point. You
can see the properly tuned first layer on the images below.
Calibration might be slightly different for multiple materials. It is a good practice to
check the first layer and adjust accordingly with
​ Live adjust Z ​ when switching
between different types of filament.
Pict. 10 - Perfect Prusa logo first layer
6.3.10.2 Check probe height ​ (kit only)
If the first layer seems inconsistent between multiple prints, the probe might be
too high. Lower it slightly. Loosen the two screws on the probe holder to make
adjustments.
​ Rotating the probe clockwise lowers it 1mm per turn. ​ It is very
handy for precise adjustments, but it can also be pushed in and out when set screws are
loosened completely. Then try again
​ Calibrate XYZ ​ . Keep in mind, the probe must be
always higher than the nozzle tip, otherwise it will catch on prints.
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