Prusa i3 MK3 - First Layer Calibration and Tuning

6.3.9  First layer calibration (kit only)
Now we will finally calibrate the distance between the tip of the nozzle and the probe.
Check if your print surface is clean! You can find instructions on how to clean it
in the chapter 6.3.2 PEI print surface preparation. Don't forget to complete 6.3.5
Calibrate XYZ chapter or you can permanently damage the print surface!
You can launch the calibration from menu Calibration -> First layer cal.
The printer will probe the bed and start printing a zig zag pattern on the print surface. The
nozzle will be at the height based on the PINDA probe setting, it must not by any means
touch the print surface.
Pict.   10   -   How   to   tune   the   nozzle   height   live   during   the   test   print.   Note:   -0.640   mm   is   only   for
illustration.   Your   setting   will   be   different!
Observe the line which is being extruded on the print surface. A new menu will automatically
show up where you can tune the nozzle height live during the test print. The point is to lower
the nozzle until the extruded plastic sticks nicely to the bed and you can see it is being
slightly squished. Set value should not exceed  -1 mm, if you have to adjust it more, move
the probe slightly higher.
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