Prusa i3 MK3 - D Ouble-Sided​ ​ T Extured​ ​ P EI​ ​ P Owder-Coated​ ​ S Pring​ ​ S Teel​ ​ S Heet

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6.3.2.1  Double-sided textured PEI powder-coated spring steel sheet
Powder coating directly on metal makes it very hard to damage this build plate. If a heated
nozzle crashed into it, the metal can dissipate the heat. Powder coating also gives the
surface a distinct textured look that will be visible on your prints.
The textured surface hides most of the mechanical damage caused by tools. Only the top of
the small bumps can be scratched, which will not imprint on the bottom of the model.
This surface is used on our print farm, look at the printed parts you have on your printer for
reference.
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6.3.2.2  Double-sided glossy PEI powder-coated spring steel sheet
Uses the same technology as the textured sheet but PEI particles used are smaller causing
the final surface finish to be glossy. Produces glass like first layer.
Be careful with tools, this surface is easy to mark and those marks then imprint on the first
layer. Marks do not affect the functionality or adhesion.
6.3.2.3  Spring steel sheet with smooth double-sided PEI
Uses the same PEI sheets as on the MK2/S.
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 the same surface look on the whole printbed you can resurface it. The easiest way is
to take the hard side of a dry kitchen sponge and wipe the affected area with a circular
motion gently a 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.
6.3.2.4  Aftermarket sheets
As MK3 is fully open source, we expect other manufacturers to manufacture after market
compatible sheets. Look for the reference online before buying some, or check with our
online support.
Sheets must be coated from both sides! If only one side is coated, the metal edge
on the bottom side can damage the heated bed surface when protective lacquer is
scratched off.
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