Prusa Research Original Prusa i3 MK2S 1.75mm, Руководство пользователя

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There are few special occasions where you will need to redo the calibration or part of it.
● Firmware update ​ - Complete guide is in the chapter ​ 12.8 Updating printer firmware ​ .
6.3.9. First layer calibration ​ needs to be rerun otherwise the printer will show an error
message.
● Replacing the PEI/Ultem sheet ​ - When PEI is changed (guide is at
manual.prusa3d.com
​
), whole heated bed is removed and reassembled. This might
change geometry of the printer and the whole
​
KIT calibration flow
​
should be
followed even on the pre assembled printer.
● Readjusting the P.I.N.D.A. 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. Printer will not respond to any request
from the host and communication will timeout, when host resets the connection, the
printer restarts and might end up in weird state requiring
​ 7.2.4 Factory Reset ​ .
6.3.2 PEI print surface preparation
To achieve the best adhesion on the new surface, it is important to keep the surface clean.
Cleaning of 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
not to touch the bed surface or the nozzle. When cleaning at higher temperatures the alcohol
will evaporate before it can clean anything. Alternatively, you can clean the bed with
​ warm
water and a few drops of a dish soap ​ on a paper towel. ​ Denatured alcohol ​ is yet another
option.
The surface does not have to be cleaned before every print! It is just important to
​ not
touch ​ the print bed with ​ your hands ​ or ​ dirty tools ​ . ​ Clean your tools with the same
solution ​ as you would the bed and you will be able to start your next print right away.
You can leave small marks on the print surface with your nozzle or tools, they will typically
be shinier than the rest. It does not affect the functionality or adhesion. However, if you want
to have same surface look on the whole printbed you can resurface it. The easiest way is to
take a hard side of dry kitchen sponge and wipe the affected area with circular motion gently
few times.
The industrial glue which holds the PEI sheet on the heatbed itself softens when
temperatures greater than 110 °C are used. If higher temperatures are used, the
glue can migrate under the PEI and create slight bumps on the surface.
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