Heatbed etc. Confusion / Yellow Warning Sticker  

Eminent Member

I've tried twice to send this question (see below) to Prusa support but it doesn't seem to be getting through.  Maybe because of attached photos?  So I am posting it here.

What is the olive green sheet in the first photo?  According to Pict. 1 on page 8 of the Handbook it is the heatbed.  But according to what is printed on it it is the "Heatbed Steel Sheet".  But aren't the heatbed and the steel sheet two separate things?  
It looks to me like the olive green sheet can be removed but it seems to be firmly attached and I don't want to break anything.  Can it be removed?  
Are "spring steel sheet" and "steel sheet" and "PEI" all the same thing? 
The first/top item on the yellow sticker (in the second photo) I think means to read the manual first.  But I do not understand the second and third items.
Thanks,  Bob


Posted : 11/08/2020 10:06 pm
Moderator Moderator

The olive green sheet is PEI sheet that you print on and enables both good adhesion when printing, but easy removal when finished.  It should NOT be removed.

Spring steel sheet and steel sheet are the same thing and refer to the removable plate (the part with the olive green covering.).

The steel sheet is separate and is held on with magnets so you can remove it and put a new one on to continue printing.

There are two types of steel sheet: Textured (which has a rough surface) and smooth (which is the one in your photo).

The yellow stickers means:

  • Read the manual.
  • Unplug the printer before doing maintenance.
  • Do not put your hands in the printer when it is operating.
This post was modified 2 months ago 2 times by 3Delight
Posted : 11/08/2020 10:30 pm
Veteran Member Moderator

Hi Bob,

the olive green sheet is the flexible removable build plate ( Heatbed Steel Sheet)
it is held in position by the magnetic attraction of a load of magnets, which are glued in recesses under the heatbed. 

the Black board that you can see peeking out of the front of the olive green sheet, is the heatbed, you can see two projections with finger prints sticking out of the front of the black board. 

If you put your thumbs on these projections, and use your forefingers to lift the corners of the olive green build plate, the plate will peel off the heatbed, as the build plate rises, the magnetic attraction will lessen, and you should be able to lift it off, easily... 

Note there are two holes at the front of the build plate, these have a film covering them(on each side), on your build plate,  these films are the Smooth PEI stickers that the models are supposed to stick to.  the holes are important in the powder coated build plates, they are used to hang the build plates, during the powder coating process they have nothing to do with the location of the build plate. 
at the rear of the build plate, there is a cut out that located the build plate against two pins which stick up out of the heatbed. 
Make sure the build plate never rests on top of the pins. 

the smooth PEI has a transparent yellow colour .   the PEI is held in place by 3M double sided, high temperature adhesive 
Finger prints and other contamination can mess up your adhesion on the build plate. keep it clean, and handle by the edges.
I wash build plates vigorously with soap and hot water, rinse with Hot Water and dry immediately, 

the dark colour under the PEI, is an antirust coating to prevent the build plate rusting.

the middle icon means, unplug from power, before working on the machine, 
the bottom one means keep your hands out of the moving mechanisms
Regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 11/08/2020 10:54 pm

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