PerfectLayer3D

Failed resin print: model detached from the build plate or stuck to the FEP

Assessed from documentation · Content verified on October 6, 2026

Where to start

  1. Before printing again, remove cured debris from the vat using the procedure for your model.
  2. Check the release film, platform and resin profile; do not use universal exposure values.
  3. If the exposure test is incomplete or the film is damaged, fix that issue before another print.
Failed resin print: model detached from the build plate or stuck to the FEP
Illustration of the defect, not a test photograph. Shapes are simplified.

How to recognise the problem

In MSLA resin printers the model grows upside down: each layer is cured by UV light on the bottom of the vat, which is a transparent film (FEP, nFEP, ACF or similar), and then peeled from the film as the build plate rises. If the peel force exceeds the model's adhesion to the build plate, or the bond between layers, the print fails.

There are three typical symptoms: the build plate comes up empty and a cured “sheet” is left on the bottom of the vat; the model starts well but at some point splits and the rest stays stuck to the film; or abnormal noises are heard as layers peel. Elegoo explicitly links abnormal noises to the model being left on the bottom of the vat; some Anycubic printers with a force sensor report detachment with an error code (for example CODE 301 on the Photon P1 Max).

Safety: liquid resin irritates skin and eyes. Wear nitrile gloves and safety glasses, work in a ventilated room, never look directly at the screen during exposure tests, and take care with a heated vat, which can be hot after printing (Anycubic points this out in its guides).

Checks in order, easiest first

Make one change at a time and verify it with a small test print, so you know which fix worked. If you use third-party resin and are unsure of the settings, Anycubic suggests testing with its official resin or the exposure calibration file (R_E_R_F) first, and asking the resin manufacturer for settings.

  1. Clean the vat: with gloves and a plastic (never metal) spatula, remove cured pieces and filter the resin. Many printers have a cleaning function that cures a layer you can peel off in one piece.
  2. Mix the resin in the bottle and in the vat: Prusa explains that resin left standing separates and changes colour; stir until the colour is uniform. Old resin, or resin reused many times, loses effectiveness.
  3. Check the temperature: Anycubic states that resin flows worse below 20 °C; Elegoo recommends printing with resin at 25–30 °C. Use the vat heater if available, or bring the resin up to temperature following the manufacturer's instructions.
  4. Clean the build plate with isopropyl alcohol and let it dry completely: Prusa warns that leftover alcohol repels the resin and the print won't stick.
  5. Only if specified in your model’s manual: Check leveling and tightness: with a sheet of paper (A4 or the one supplied) the resistance must be even on all sides. Make sure the build plate, vat and film retaining screws are tight.
  6. Review the settings: bottom-layer exposure and count, normal exposure, lift speed. Start from the resin maker's values and change one parameter at a time.
  7. Reorient the model and check supports: reduce solid cross-sections parallel to the screen and sudden changes in cross-section; add drain holes to hollow models to avoid a suction-cup effect.
  8. Inspect the film against the light: scratches, dents, holes, heavy clouding or a slack film. A punctured film must be replaced immediately because resin can reach the screen.
  9. If nothing changes, run the exposure test with paper on the screen: if the image does not match what is expected, the problem is in the exposure system and support should be contacted.

Manufacturer guidance (Anycubic, Elegoo, Creality, Prusa)

Anycubic (Photon Mono M7 Pro, Photon P1 Max): the model-not-sticking guide starts with cleaning the vat, then the exposure test, resin settings with test files, ambient temperature with vat heating, paper leveling and, if needed, mechanical calibration of the build plate. For CODE 301 it also lists unmixed resin, insufficient heating time, incorrect supports and a build plate dropped or replaced without recalibration. For the Photon P1 film it says to replace it according to the print/layer counter, remove residue with the cleaning function and a plastic scraper (never sharp objects), and pour the resin back into the bottle if the printer will sit idle for 48 hours.

Elegoo (Saturn 4 Ultra, Mars 5 Ultra): for a model stuck to the vat it suggests, after filtering the resin, preheating it, optimising orientation (described as one of the most effective fixes), moderately reducing exposures, increasing the wait after release, trying a different layer height and lowering light intensity (PWM); for some models it provides a G-code file that reduces pressure on the build plate. For Saturn 4 Ultra leveling it describes fine-tuning the build plate screws with four pieces of paper at the corners.

Creality (HALOT): besides bottom exposure and leveling, it mentions motor speed too high, missing drain holes in hollow models, a slack release film (treated as a consumable), a build plate that is too smooth or not clean, cold resin and a loose Z-axis belt. Prusa (SL1/SL1S): inspect the vat bottom before and after every print, wash the FEP film with warm water and mild soap, and never use isopropyl alcohol on the film. Procedures differ between brands: always follow your printer's manual.

When replacing a part is justified

The release film is a consumable: replace it when it is punctured, scratched, dented, slack, or when the printer's counter asks for it. For the HALOT-X1, Creality states replacement every 10–20 prints; for other models follow the manufacturer's guidance. Never print with a damaged film: resin can end up on the LCD screen.

Before suspecting the build plate or the screen, work through the checks above. Replace or restore the build plate only if it is warped or damaged (Creality suggests sanding if it is too smooth); replace the screen or UV panel only if the exposure test shows an incomplete or missing image. In those cases record a video of the test and contact support, as Anycubic and Elegoo advise.

How to verify the result

Record the model and variant, material, slicer profile and change made. Repeat the same test and compare the result with a photo taken before the adjustment. Keep the change only if it improves the defect without introducing others. Use your model’s instructions for temperatures, calibration and disassembly; this guide is not based on our own hands-on tests.

The most common causes

The official documentation from Anycubic, Elegoo, Creality and Prusa keeps pointing to the same causes: resin too cold (more viscous), unmixed or degraded resin, bottom-layer exposure too short for that resin, an unlevel or loose build plate, a dirty build plate or one still wet with isopropyl alcohol, model orientation with very large cross-sections or sudden changes in cross-section, inadequate supports, lift speed too high, a worn or slack release film, and cured debris left in the vat from a previous print.

The causes differ with the symptom. If nothing is left on the build plate, look mainly at adhesion and the base: leveling, build plate cleanliness, bottom exposure, temperature. If the model detaches mid-print or sticks to the film, the peel force (orientation, large cross-sections, lift speed, excessive exposure) and the film condition matter more. Elegoo lists exposures that are too long and light intensity that is too high among the causes of a model stuck to the vat, the opposite of what people usually assume: more exposure is not always the answer.

What users report in the forums

In the Prusa forum for the SL1, users often report that the first layer cures in the vat but does not stay on the build plate. Fixes they report include thorough build plate cleaning, longer initial exposure, recalibrating after moving the printer, and checking the film retaining screws, which change the vat height when loose. Some users also describe “priming” the build plate with a thin cured layer of resin before printing: this is a community workaround, not an official procedure.

In another thread, with a model sticking to the film, users suggested using the slicer's optimised orientation to reduce stress on supports, compensating with more exposure or denser supports in cold rooms, and lifting residue with a plastic spatula without forcing it. The most common mistakes are cleaning the film with alcohol (Prusa forbids it for its own film), printing with a still-wet build plate and changing many settings at once.

Find a solution

Affected printers

Printers →

Sources