Core ONE L Smooth PEI print sheet

Double-sided smooth PEI print sheet designed specifically for the Prusa Core ONE L. It combines spring steel with high-quality PEI-Ultem film, providing reliable adhesion, excellent surface finish of prints, and long service life.

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Key features

• Designed for Prusa Core ONE L
  Precise dimensions and magnet layout match the heated bed of the Core ONE L printer. Not compatible with other models (Core ONE/+, MK4, MK3/S/+, MK2.5/S, MINI, XL, etc.).
• Double-sided smooth PEI surface
  Both sides of the spring steel sheet are covered with a PEI-Ultem film, which ensures excellent adhesion without the need for special adhesives for most materials.
• Ideal for PLA and common materials
  The sheet is excellent for PLA and also works very well with PETG, ABS, ASA, and other standard materials, provided the recommendations for cleaning and surface preparation are followed.
• Perfectly smooth first layer
  The smooth PEI surface creates a glossy, even first layer. Even small and thin details have a high chance of remaining firmly attached during printing.
• Easy print removal by bending the sheet
  After the bed has cooled down, the sheet can be slightly flexed and the print will usually release on its own, without the need to use metal tools that could damage the PEI.
• Durable and replaceable consumable
  The PEI surface is a consumable material – it will naturally wear out over time, but with proper maintenance it will last a long time. The spring steel ensures mechanical durability and dimensional stability.

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Compatibility

• Compatible:
  • Prusa Core ONE L
• Not compatible:
  • Prusa Core ONE/+
  • MK4, MK3/S/+, MK2.5/S
  • MINI/MINI+
  • XL and other models

This specific model is intended only for the larger Core ONE L printer. For the standard Core ONE/+ there is a separate variant of the smooth PEI sheet.

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Recommended use by material

• PLA
  • Ideal combination: excellent adhesion and surface finish
  • Glue is usually not needed
• PETG
  • Very good adhesion
  • To prevent surface damage, it is generally not recommended to clean with isopropyl alcohol before printing PETG – on smooth PEI sheets, adhesion that is too strong can damage the film.
• Flex (TPU/TPE)
  • When printing flexible materials, it is recommended to apply a thin layer of glue stick (e.g. KORES) to prevent overly strong adhesion and damage to the PEI when removing prints.
• ABS / ASA / other technical materials
  • Good compatibility with proper temperature settings and use of skirt/brim, especially for larger models.

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Maintenance and cleaning

For long service life and stable adhesion, follow these recommendations:

• For regular degreasing (e.g. before printing PLA), use isopropyl alcohol (IPA) and a soft, lint-free cloth.
• In case of minor marks from the nozzle or tools, the surface can be gently “matted” with the rougher side of a dry kitchen sponge, using light circular motions.
• Avoid aggressive solvents (especially acetone), which can irreversibly damage the PEI film.
• Do not use sharp metal spatulas – always remove prints after cooling and by flexing the sheet if necessary.

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Who this sheet is suitable for

• For users of the Prusa Core ONE L who:
  • need a replacement original smooth PEI sheet,
  • want to have multiple sheets for quick switching between print jobs,
  • prefer a smooth, glossy first layer and a clean surface finish of models,
  • mainly print from PLA, PETG, and common technical filaments.

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Main benefits for your printing

• professionally smooth, representative appearance of the bottom side of prints,
• high reliability of first-layer adhesion without complex chemistry,
• quick sheet replacement and model removal thanks to spring steel,
• original part designed directly by the printer manufacturer (Prusa Research),
• minimal need for additional post-processing of model surfaces after printing.

Key features:

• Original smooth PEI print sheet for the Prusa Core ONE L 3D printer
• Double-sided PEI-Ultem surface for long service life and stable adhesion
• Ideal for PLA and suitable for a wide range of common filaments
• Provides a perfectly smooth, representative first layer of prints
• Spring steel allows easy removal of prints by flexing the sheet
• Compatible exclusively with the Core ONE L model – precise dimensions and mounting
• Easy maintenance using IPA and gentle mechanical cleaning
• Excellent choice as a replacement or second print sheet for fast switching between print jobs