Smooth PEI Spring Steel Sheet for MK2.5,MK2.5S, MK3, MK3S, MK3S+ | Original Prusa

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Spring Steel Sheet with Smooth Double-sided PEI

This is the replacement Spring Steel Sheet with smooth double-sided PEI for the Original Prusa i3 magnetic heatbeds.


  • Spring Steel Sheet (1 pcs)
  • Smooth PEI-Ultem sheet (2 pcs) - already mounted and fixed in place on each side of the steel sheet

The MK52 heatbed has embedded high Curie temperature magnets. These magnets are able to firmly hold these removable spring steel sheets. The Spring Steel Sheet with smooth double-sided PEI uses the same PEI sheets as on the MK2 and MK2S. It is the best solution for printing PLA and it has great adhesion with almost all materials. The bottom of your prints will be smooth.

  • Perfect for PLA
  • Great adhesion with almost all materials
  • Smooth bottom of prints
  • Tiny details will stick great
  • Do not clean with IPA before PETG
  • Release agent might be necessary
  • You must apply glue stick when printing Flex
  • Do not clean with IPA before PETG, Release agent might be necessary
  • You must apply glue stick when printing Flex

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 functionality or adhesion. However, if you want to have the same surface look on the whole print bed 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.

Find more details about the spring steel sheets in the Prusa knowledgebase.


The steel sheet color may differ from the product picture (black, gold, green, etc). The smooth PEI surface on the steel sheet, as well as all other properties, remain the very same for all color versions.


Consumable parts, such as PEI sheets (smooth, textured, etc.) are not covered by warranty as the coatings are designed to diminish over time unless failure has occurred due to a defect in materials or workmanship. Cosmetic damage, including but not limited to scratches, dents, cracks or other cosmetic damage is also not covered by the warranty. Only defective sheets on arrival are covered by warranty.

Tiny dots may appear on the PEI-Ultem steel sheet surface. These can slightly affect the finished print bottom surface. However, they do not impact the printing process, reliability in any way. Prusa does not consider these dots a reason for a warranty claim.


  • Prusa MK2.5
  • Prusa MK2.5S
  • Prusa MK3
  • Prusa MK3S
  • Prusa MK3S+

To replace This part, please consult the Prusa Assembly Manuals. Make sure to follow the manual for your printer model.

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Additional Information

Print Surfaces
Build Plate
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