Prusa i3 MK3 - Steel Sheet Preparation

There are few special occasions where you will need to redo the calibration or part of it.
● Firmware update - A complete guide is in the chapter 12.9 Updating printer
firmware. 6.3.9. First layer calibration needs to be rerun otherwise the printer will
show an error message.
● Readjusting the PINDA probe - Run 6.3.6 Calibrate Z to store new reference Z
height values.
It is important to disconnect the printer USB from any computer or OctoPrint running
on Raspberry Pi for the whole calibration because during the calibration, the printer
will not respond to any request from a host connected via USB, and communication
will time out.  Such a time out would cause the host to reset the connection, causing
the printer to restart (in the middle of calibration) and it might end up in a weird state
requiring 7.2.6 Factory Reset.
6.3.2  Flexible steel sheet surface preparation
The MK52 heatbed has embedded high curie temperature magnets. These magnets are
able to firmly hold removable spring steel sheets. There are two pins at the end of the
heatbed that will align perfectly with cut out slots in the spring steel sheets. Make sure the
bed is clean and there isn’t any debris on it before you put on the steel sheet. Never print
directly on the heatbed.
Pict.   5   -   HeatBed   MK52   base   and   powder   coated   steel   sheet   surface
To achieve the best adhesion on the new surface, it is important to keep the surface clean.
Cleaning the surface is very easy. The best option is Isopropyl alcohol available in
drugstores which is the best for ABS, PLA and others (except for PETG where the adhesion
may be too strong. See the chapter 11.3 PET for instructions). Pour a little amount on
unscented paper towel and wipe the print surface. The bed should be cleaned while cold for
the best results but it can also be cleaned when already preheated for PLA, just be careful
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