⬢The PEI surface is very durable, however, it is possible to damage it.

⬢Make sure you always wait a while after bigger prints are finished. Before you try to remove the printed objects.

⬢Have a look in the 3D Printing Handbook for materials, which need special treatment of the PEI surface to avoid future damage to your printer.

⬢If your printing surface is damaged severely, let's move to the next step.

As soon as you remove the damaged PEI sheet, please apply a new one. The PEI sheet works also as protection against atmospheric corrosion.

⬢Kitchen freezer

⬢New PEI sheet (order here, you must be logged in)

⬢Slotted screwdriver for PEI sheet removal

⬢Limonene (Lemonesol, D-limonene or something similar)

⬢Nitrile gloves (more than one pair)

⬢Paper towels (on a roll)

⬢Disposable fabric towels (on a roll)

⬢Sharp knife for PEI sheet trimming

⬢Plastic scraper (ice scraper will do fine)

⬢Microfibre cloth to prevent scratches to the new PEI surface

⬢Plastic bag bigger than the steel sheet

⬢Surface to work on - best is sturdy foam board, ideally at least twice the size of the steel sheet. A thin plastic sheet isn't recommended.

⬢Glass of clean tap water

⬢IPA or acetone

Get all those items in advance, it is very complicated to stop or even pause in the middle of the process.

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This guide works also for Original Prusa MINI/MINI+ smooth PEI steel sheets.

Since these are a little bit smaller, the difference is that after applying a new PEI sheet you have to trim more material from its sides.

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The same new uni-size replacement MK3S+ PEI sheet can also be used for older MK2S printer heatbed. Compared to the discontinued MK2S PEI sheet, the MK3S+ PEI is a bit larger and more material has to be trimmed after applying.

After you get the new PEI sheet and all the other necessary materials, please follow the older guide for MK2S printer.

⬢Time is of the essence here! As soon as the temperature increases, the glue between the PEI sheet and surface of the steel sheet activates again!

⬢Take the steel sheet out from the freezer and using a sharp tool (e.g. screwdriver) lift one edge of the PEI sheet.

⬢Peel the entire PEI sheet off. The frozen glue will remain on the steel sheet. Proceed quickly!

If your PEI surface is damaged from the other side as well, you can remove it now.

⬢Pour the Limonene on the paper towels until they are completely soaked with it.

⬢Place the steel sheet with towels in a plastic bag to slow down Limonene evaporation.

Seal the bag to prevent the Limonene evaporating out. You can use the plastic bubble bag your steel sheet originally arrived in or any other plastic bag, which can be reasonably sealed.

⬢Get a plastic scraper and start peeling the glue from one corner.

⬢Try concentrating the glue in one place, it will be easier to remove it as one piece.

⬢Sheet looks almost clean, but we need to make sure all the glue is out. Proceed to the next step.

Now, use the fabric towels to clean the scraper. Paper ones tend to tear up easily.

⬢Take a closer look at the sheet, there might be spots with the remaining glue.

⬢Soak them with Limonene again, let it interact for few seconds and start removing the glue with the scraper again.

⬢This is how the steel sheet should look like. No bumps or spots with the glue.

⬢Apply this procedure on the entire sheet and repeat it until the steel sheet is completely "glue-free". Clean your scraper after each round, so you won't spread the previously removed glue.

Use the fabric towels to clean the scraper. Paper ones tend to tear up easily.

⬢The PEI sheet is NOT SQUARE, compare it to the steel sheet to find proper orientation

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Properly oriented PEI sheet must stick out 1-2 mm on each side.   

There may be a larger overhang if you´re replacing the PEI sheet on Prusa MINI/MINI+ steel sheet or your MK2/MK2S

⬢Peel out about 2 cm (1 inch) of glue protector from the SHORTER side of PEI sheet as shown in the picture.

⬢Make sure the PEI sheet is placed as shown in the picture. The edges of the PEI sheet have to be aligned with the edges of the steel sheet. The PEI sheet can slightly overlap the steel sheet edges, we will trim it later.

⬢Take a closer look to ensure both the PEI sheet and the steel sheet edges are aligned (parallel).

⬢Wrap the plastic scraper in the microfibre cloth and start pressing the PEI sheet against the steel sheet.

⬢Cover the entire surface of the steel sheet, use the scraper in all directions, BUT BE CAREFUL around the edges! See the next step for more.

⬢BE EXTRA CAREFUL while working near the edges. ALWAYS swipe only out from the sheet, NEVER back. You might accidentally lift the PEI sheet up and let some air under it.

⬢Swipe across the entire surface and be careful around the edges.

⬢When ready, leave the glue do its work for a few minutes. You can clean most of the tools, leave just the knife, IPA and towels with you.

⬢Trim the extra PEI sheet using a sharp knife you prepared earlier. ALWAYS cut from the side of the applied PEI sheet.

⬢No need to perforate the circular openings. Those are used to hang the steel sheet during the manufacturing process.

⬢Be careful while cutting out the V-shaped openings, ALWAYS cut towards the steel sheet, NEVER outwards. Again, you might lift the PEI sheet.