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Hardware · BedbeginnerFDM~3 min read

Build Plates and Surfaces

Short answer

Smooth PEI grips most filaments strongly but can bond too well to PETG and TPU, so those need a thin glue stick layer as a release. Textured and satin powder-coated sheets release prints as they cool and suit PETG, but must never be cleaned with acetone. Most adhesion problems are grease: clean the cold sheet with the alcohol your plate maker specifies.

What the surface has to do

A build surface has two jobs that pull against each other: hold the first layer firmly while printing, and let the part go afterward without damage. Each surface strikes that balance differently for each material, which is why plate makers publish a material table for each sheet. Many printers, Prusa's among them, use a removable spring-steel sheet held on a magnetic bed, so you can flex the sheet to pop parts off and swap surfaces for different materials.

The common surfaces

The descriptions below come from Prusa's documentation for its own sheets. Other makers' sheets with the same name are similar in kind but not identical, so check your plate maker's table.

SurfaceGrip and finishGood for (Prusa)Needs a glue release layer (Prusa)
Smooth PEIStrong grip, glossy undersidePLA, HIPS, ABS and ASA, metal and wood compositesMay be needed for PETG, ASA, ABS, PC Blend; TPU and PETG can bond too strongly
Textured powder-coated PEITextured underside, prints release on coolingPETG, CPE, TPU and TPE (no glue needed for flexibles)ASA, ABS, Nylon, PC Blend
Satin powder-coatedBetween smooth and textured; light matte texturePLA and PETGTPU and TPE; PC if printed often

Prusa notes that ASA and PC adhere less well to satin than to smooth PEI and often need a brim or draft shield; see Brims, Rafts and Skirts.

Glue as a release layer, not just as glue

The practical surprise for beginners is that glue stick is often there to protect the sheet, not to add grip. Prusa warns that TPU and PETG can adhere so strongly to smooth PEI that they damage the sheet on removal, and recommends a thin layer of glue stick as a separation layer. Bambu Lab's filament guide recommends glue on its plates for the same reasons: better adhesion, easier removal, and protection of the plate surface. Apply it thinly and only where the maker's table calls for it.

Cleaning

Grease is the most common reason a good sheet stops working. Prusa says any grease greatly reduces adhesion, and fingerprints show exactly where to clean.

  • Alcohol, on a cold sheet. Prusa specifies about 90 percent isopropyl alcohol or denatured alcohol Maker spec on an unscented paper towel, and warns against anything made for skin, because moisturizers leave a film.
  • Acetone only on smooth PEI, and rarely. Prusa allows acetone on its smooth sheet when alcohol is not enough, no more than 1 to 2 times per month Maker spec. On textured and satin sheets: never. Prusa says acetone deteriorates those surfaces.
  • Soap and water as a last resort. For textured and satin sheets, Prusa suggests dish soap and warm (not hot) water when alcohol fails, not too often, and says not to leave the sheet wet.

Removing prints without damage

  • On textured and satin sheets, let the sheet cool; Prusa says prints release on their own.
  • Flex a spring-steel sheet off the bed rather than prying on the bed.
  • Prusa recommends a plastic scraper on textured and satin sheets, since they are not scratch-resistant, and notes that metal spatulas can leave cosmetic scratches even on smooth PEI.
  • Prusa says never to put its sheets in a freezer.

When a sheet is worn out

Sheets are consumables. Prusa says its smooth PEI can smooth out and lose grip after 1 to 2 years of heavy use, and that light sanding with 600 to 1000 grit paper can revive it Maker spec. Powder coatings wear down over time; Prusa describes sanding as a revival only for smooth PEI. Bubbles under smooth PEI, Prusa says, are not serious and usually fade.

Switching surfaces changes your first layer

Sheets differ in thickness. Prusa notes that switching sheet types on its probe-equipped printers means readjusting the nozzle height. Whatever your printer, check the first layer after changing sheets; see Z Offset.

When prints will not stick

  1. Clean the cold sheet with the maker's recommended alcohol.
  2. Check the plate maker's table: is this material on the right surface, and does it need glue?
  3. Check first layer height before blaming the surface. See First Layer Won't Stick.
  4. If an old smooth PEI sheet still fails when clean, follow its maker's revival advice or replace it.
Sources

Last reviewed 2026-11-05

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