memory. During normal bed leveling, it is expected that the SuperPINDA probe
triggers no more than 1 mm from the reference value, therefore the nozzle is not
allowed to move more than 1 mm below the reference value during the bed
calibration.
If you moved the printer, you may need to re-run the Z calibration to sample new
reference Z height values reflecting the twist and bend of the table surface the printer
is sitting on. If that does not help, please verify, that the SuperPINDA probe is aligned
with the sensor points on the print bed during the bed Z calibration. The alignment
shall be ensured by the automatic X/Y calibration routine. If the SuperPINDA probe is
not aligned during the Z calibration over time, it is possible, that a pulley is slipping or
something on the machine’s frame got loose.
3)
Bed leveling failed. Sensor triggered too high. Waiting for reset.
Similar to case 2). This time the SuperPINDA sensor triggered more than 1 mm
above the reference height. Before doing anything else, make the Z-axis level by
going all the way up and try again.
6.3.6 Calibrate Z
Calibrate Z
is located in the
LCD Menu - Calibration - Calibrate Z
.
It is always done with
the steel sheet on.
It should be performed whenever you move the printer to a different
location. It saves the heights of all 9 calibration points in non-volatile memory. The stored
information is used every time mesh bed leveling is called during a print. When the
measured values are vastly different from the stored values, the print is canceled because it
is a good indicator something is wrong. Calibrate Z is a part of the routine Calibrate XYZ so
there’s no need to run it after a successful Calibrate XYZ.
It is a good practice to run this procedure every time you travel with the printer or the printer
is shipped the geometry might change slightly and cause an error.
At the start of the Z calibration procedure the printer homes X and Y-axis. After that, Z-axis
will begin to move up until both sides touch the printed parts at the top.
Please make sure the Z-axis went all the way up and you heard a rattling sound as the Z
stepper motors skip steps. This procedure ensures that 1) the X-axis is perfectly horizontal,
2) the print nozzle is in a known distance from the print bed. In case the Z carriage did
not
touch the end stoppers, the printer could not possibly know the height of the print nozzle
above the print bed and the Z calibration procedure will fail.
The Z calibration procedure also prompts you to
"Please clean the nozzle for calibration.
Click when done."
If this advice is not followed and there is plastic debris on the print nozzle, then the debris
may touch the print bed or even push the print bed away from the SuperPINDA probe, so the
SuperPINDA probe will not trigger properly and the calibration will fail.
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