Print stuck to the bed or tearing the build plate

This guide is for anyone fighting a print that's welded to the build plate, or who has already pulled up a chunk of PEI. It covers why it happens, which filament and plate pairings Prusa, Bambu Lab and BIQU warn against, how to remove a stuck print safely, how cleaning changes adhesion, and when a plate is past saving. If your problem is the opposite, prints coming loose, see our first layer adhesion guide.

Why do prints stick too well?

Polymaker says strong adhesion happens "when the first layer squishes too much into the plate," or "when the filament chemically bonds to the surface at elevated temperatures." It warns that too much adhesion risks "tearing the print's bottom layers, gouging the build surface, or leaving filament residue."

Three things usually combine:

• A material that grips a surface too hard. Prusa's smooth sheet article says some filaments, "like TPU and PETG, will adhere too much and can damage the sheet when removed."
• Heat. Bambu Lab's cleaning guide says "higher heatbed temperatures result in stronger adhesion." Prints release as the plate cools, so a warm plate holds on harder.
• A first layer that's too low. Polymaker's first step for over-adhesion is to calibrate Z offset, because "a nozzle too close flattens the first layer into a pancake that fuses permanently."

PETG and TPU on smooth PEI

This is the most common way to damage a plate. Prusa's surface preparation guide calls it the "most common" example: PETG "has great adhesion to a clean, degreased, smooth PEI sheet, making it extremely hard to remove. Removing the print often leads to peeling off the PEI surface and irreversible damage to the sheet."

Prusa's advice for its own sheets:

• PETG. Prusa's PETG guide says, "Do not print on the smooth PEI sheet as the adhesion may be too strong!" It recommends a powder-coated textured or satin sheet. If you use the smooth sheet anyway, apply glue stick before printing. Our PETG printing problems guide covers PETG sticking too well alongside its other common issues.
• TPU and other flexibles. Prusa says flexible filaments need a powder-coated sheet or "a special separator on the print surface (glue stick or Kapton tape)." On a smooth or satin sheet, apply a separation layer. The textured sheet needs none, and Prusa says the print "can be easily removed without damaging the surface."
• ABS, ASA and PC Blend. Prusa says these may also need glue stick "applied thinly" on the smooth sheet.

On these sheets, Prusa treats glue stick as a separation layer and says that skipping it where the material table asks for one "may lead to damaging your sheet." It recommends a thin layer of PVA glue applied on a cold sheet, since a thick layer can leave marks on the print.

Plate and material pairings makers warn against

Advice is specific to each maker's plates, so check the guide for the exact plate you own.

Prusa publishes a material table that pairs each filament with each of its sheets: a green check means degrease and print, a yellow exclamation mark means use a separation layer, and a red X means "Do not print! The chosen material may damage your print sheet!"

Bambu Lab also cautions against too much glue grip. Its plate guide says to make sure the print adheres "without causing damage to the surface by sticking too tightly. Otherwise, the sheet may bubble or crack," and that third-party glues "are strongly discouraged and may damage the plate."

Textured PEI isn't a cure-all for polyester filaments. Prusa says its textured sheet is "perfect when printing a lot of high-adhesion filaments like PETG" and that prints "automatically detach after the sheet cools down." Polymaker's guide, which covers PET materials including PETG and PET-GF as well as CoPE, says those bond aggressively to bare textured PEI and calls for a release agent on every such print. If you print PETG or another polyester on a textured plate, check the guidance from both the plate maker and the filament maker.

Our textured vs smooth build surfaces guide explains the trade-offs between surface types in more depth.

How do you remove a stuck print safely?

Work through these in order, stopping when the print comes free.

1. Let it cool completely. Prusa, Bambu Lab and BIQU all start here. For its Textured PEI Plate, Bambu says prints "come off easily when the temperature of the heatbed reaches room temperature." BIQU's CryoGrip Pro guide says to "allow the plate to cool completely to room temperature." Polymaker says to let the whole bed cool below 40 °C.
2. Take the plate off and flex it. Prusa says to bend the sheet "inwards and outwards." Bambu's filament guide says to remove the plate once cooled and "gently flex it to release the model." BIQU says to "gently flex the plate."
3. Reheat and cool again. For a print that still won't release, Prusa suggests reheating the bed "for a few minutes (to the original print temperature)" and letting it cool again. For the Cool Plate SuperTack, Bambu suggests warming the plate to around 50 °C on the bed and trying again.
4. Use alcohol at the edge (Bambu plates). For the Cool Plate SuperTack and Engineering Plate, Bambu suggests applying alcohol where the model meets the plate, then gently lifting with a scraper.
5. Use a scraper only if your plate allows it. See the next section.

Flexing doesn't suit every print. Bambu says large, flat, low models such as art panels or lithophanes, and prints with extensive tree supports and brims, "are generally not suitable for removal by flexing the plate" on the Cool Plate SuperTack, and suggests the scraper-assisted methods instead.

Which plates can take a scraper?

• Prusa textured (powder-coated) sheet: "Not scratch-resistant. Do not use metal spatulas, etc., to remove the prints." Prusa suggests printing a plastic spatula.
• Prusa smooth PEI sheet: Prusa says it "can be used with a metal spatula; however, cosmetic scratches may appear."
• Any Prusa sheet: If you use a spatula, Prusa says to "bend the sheet slightly and insert the spatula under the model whenever possible, instead of digging under the model on a flat surface."
• Bambu Cool Plate SuperTack and BIQU CryoGrip Pro: Both makers say their low-temperature coatings are softer than textured PEI and more prone to scratches, though minor scratches from normal use won't significantly affect adhesion. Bambu suggests wetting the contact area with alcohol before using a scraper.
• Polymaker recommends "wide plastic spatulas or nylon scrapers" and says to avoid "metal or hammering, which chips PEI."

Stop it happening next time

• Use the right surface or a separation layer. Follow the table above for your plate.
• Lower the bed temperature a little. Bambu (for the Cool Plate SuperTack) and BIQU both suggest slightly reducing bed temperature in future prints if adhesion is excessive. Polymaker suggests dropping it by 5 to 10 °C from recommended settings.
• Raise the first layer slightly. Polymaker suggests raising Z offset in 0.02 to 0.05 mm steps until the skirt goes down cleanly with visible gaps between lines. Prusa's Live adjust Z guide points the other way for PETG on its printers, saying PETG needs to be "squished in the surface slightly more" than PLA, so on a Prusa smooth sheet use the separation layer first.
• Choose the right sheet profile. Prusa says that on its printers without a load cell, each sheet needs its own Live Z value because they differ in thickness. A first layer tuned for one sheet may be too low on another.

Cleaning that changes adhesion

Grease reduces grip, and the wrong cleaner can damage the surface. Follow the instructions for your exact plate.

• Prusa smooth PEI: Clean with about 90% isopropyl alcohol (IPA) or denatured alcohol when cold, on an unscented paper towel. Prusa allows acetone "1-2 times per month" if IPA isn't enough.
• Prusa textured sheet: IPA or denatured alcohol when cold. "Never clean the sheet with acetone! It will deteriorate the surface!" As a last resort, Prusa suggests warm (not hot) water with a few drops of dish soap, not done often, because the textured sheet "is not waterproof."
• Bambu Lab Textured PEI Plate: Bambu recommends dish detergent, a sponge and warm water, then drying with a paper towel. It says alcohol "might just spread the oils" on a textured surface. Don't use acetone, and use a detergent without oils or moisturizers.
• BIQU CryoGrip Pro: BIQU says to clean Frostbite with soapy water, and Glacier with alcohol or soapy water.
• Any plate: Keep skin oils off the surface. Prusa, Bambu Lab and BIQU all say skin oils reduce adhesion, and Prusa says products made for skin "can contain oils that ruin adhesion."

Makers disagree on acetone. Polymaker says never to use it on PEI, Bambu Lab says not to use it on its plates, and Prusa allows occasional use on its smooth PEI sheet but never on its textured sheet. Go by the maker of the plate you own.

Cleaning works in both directions. Prusa's warning about PETG tearing smooth PEI is specifically about a "clean, degreased" sheet, so a freshly cleaned smooth plate still needs a separation layer for PETG.

When the plate is damaged

Not every mark is damage. Prusa says small bubbles under smooth PEI "usually do not affect print quality" and disappear over days or weeks. Bambu says first-layer marks or discoloration on the Cool Plate SuperTack are normal, and BIQU says the same for CryoGrip Pro.

Real damage looks different. Prusa's guidepost describes a surface where "a piece of the surface was ripped off or cracked" during removal. What makers say you can do:

• Revive a worn surface. Prusa says a smooth PEI sheet can smooth out after 1 to 2 years of use, and light sanding with 600 to 1000 grit paper can bring fresh PEI to the surface. Bambu says sanding its Textured PEI Plate with fine sandpaper creates a new, clean surface, as long as you clean off the debris.
• Replace the PEI film (Prusa smooth sheet). Prusa says the smooth PEI film on the steel sheet can be replaced in case of extensive damage.
• Replace the plate (Bambu PEI and SuperTack plates). Bambu says its Textured PEI Plate, Cool Plate SuperTack and Smooth PEI Plate don't support replacing the surface sheet, so a damaged one means a new plate.
• Check warranty expectations. Prusa treats print sheets as consumables. Its warranty covers sheets defective on arrival, not wear or cosmetic damage such as scratches, dents or cracks.

Before buying a replacement, check which surface suits the materials you print, so the new plate doesn't go the same way. If a torn sheet came from PETG or TPU on smooth PEI, a textured plate or a separation layer is the fix, not the same plate again.

Build plates: what to check before you buy ↗