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When a large resin print comes loose, first check whether the raft detached from the build plate or the model separated from its supports. Then clear the vat, verify the plate and Z calibration, and confirm that the resin profile matches your printer. Only after those checks should you adjust bottom exposure, lift speed, or the model. Large prints can put more stress on their first-layer bond, but there is no single exposure time or fix that applies to every printer and resin.
Start by identifying what actually failed
Look at the build plate, the failed print, and the vat before changing settings. The shape and location of the cured resin left behind can distinguish a plate-adhesion problem from a support or geometry problem. Those failures can look similar in a slicer preview but call for different fixes.
The plate is bare and a flat cured patch is on the vat film
This pattern indicates that the print detached from the platform and remained on the vat’s release film. A raft that has separated only in part is also a plate-adhesion failure. Check the plate, its Z calibration, the resin profile, and the first-layer settings before starting another job. Formlabs describes this as non-adherence and notes that debris, clouding, damage, or contaminated optical surfaces can also interfere with curing: Formlabs’ non-adherence troubleshooting guide.
Note exactly what is left behind: a broad, flat cured patch on the film, a partial raft on the plate, or no cured material at all. These observations help separate a weak plate bond from a curing or vat problem. Avoid scraping or restarting immediately; first make sure any cured material is removed safely and the film has not been damaged.
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The raft is still on the plate, but the model is missing or broken away
If the raft stayed attached and the object separated at the supports, do not treat the failure as a simple leveling problem. Inspect support strength and placement, the model’s orientation and hollowing, and the geometry’s cross-section during printing. Formlabs distinguishes a raft that remains attached while layers separate from a print that never adhered to the platform. Phrozen’s support-failure guidance also addresses cases where supports print but the model does not: Phrozen’s support-failure guide.
This distinction matters because increasing bottom exposure is aimed at the first layers’ bond to the plate. It does not automatically make a weak support connection, poor support placement, or a difficult model orientation reliable. If the base is intact, troubleshoot the part of the print that failed rather than changing every adhesion-related setting at once.
Clear the vat and check for damage before retrying
Do not start another print while cured resin or other debris may be in the vat. A new job can press the build plate into debris and damage the release film or screen. Wear gloves to avoid contact with liquid resin, and use the printer maker’s recommended method and tools to remove cured material. Inspect the vat film for debris, clouding, punctures, or other damage. Formlabs warns that tank condition and contaminated optical surfaces can weaken or block curing; Phrozen likewise advises removing cured resin from the vat before printing again.
Use care when inspecting a tank: Formlabs warns against metal tools for some resin tanks. A tool or scraper suitable for removing a print from a build plate is not automatically safe for the vat film. Phrozen describes a metal scraper for build-plate removal, but that does not establish it as safe for every tank or release film. Follow the exact printer’s manual for cleanup.
If resin cured neither on the plate nor in the vat, include the printer’s screen or light source among the checks. A failure to cure anywhere points beyond ordinary plate adhesion; consult the printer’s troubleshooting instructions before changing exposure settings.
Also check whether the vat and optical path are clean and in usable condition. Resin or debris on an optical surface, a cloudy or damaged tank, or a compromised release film can affect curing or layer release. Do not assume that every flat patch on the film means the plate alone is at fault. Clear the tank, inspect the film and follow the manufacturer’s inspection and replacement guidance for your machine.
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Check the build plate and recalibrate Z
After clearing the vat, inspect the plate for residue, unevenness, or a surface condition the printer maker identifies as unsuitable. Then recalibrate the Z axis using the procedure for your exact printer model. Do not rely on a generic leveling sequence: the required setup and reference surface can differ between machines.
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Phrozen lists incorrect leveling, an uneven plate, and an overly smooth surface as possible causes of poor adhesion. Its guide suggests using a ruler and backlight to check plate evenness. If the plate appears uneven, consult the manufacturer about correction or replacement rather than assuming that sanding will make it flat.
Phrozen also suggests 80-grit sandpaper as an option when a plate is too smooth. Treat this as model-specific advice, not a routine maintenance step: abrading a plate changes its surface, and the evidence does not establish that every printer’s plate should be sanded. Check the printer maker’s recommendation before altering the surface. If that maker confirms sanding is appropriate for your plate, use the suggested grit only as directed; otherwise leave the plate unmodified.
After calibration, confirm that the plate is seated and secured as the manual specifies. A Z calibration that was performed using the wrong procedure or reference may not resolve the problem. If you are unsure whether the plate is level or even, record what you see and ask the printer maker for model-specific instructions instead of improvising a correction.
Confirm the resin profile before changing exposure
Bottom exposure controls how long the initial layers receive light, helping them bond to the plate. The useful setting depends on the resin, printer, model, and compatible screen or profile. A number copied from another owner may not apply even if the printer looks similar: different resin colors, printer models, and profiles can require different exposure settings.
Check the resin maker’s settings for the exact printer, resin, and color, and confirm that the selected profile is intended for that machine. ELEGOO’s published exposure table is for specific resins on the original Mars; its page directs users of other models to the official resin setting sheet. Its machine-specific figures should not be transferred to other printers as universal values.
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| Guidance | What it says | Scope and caution |
|---|---|---|
| Phrozen, general adhesion guide, updated September 30, 2025 | Increase bottom exposure by 20% for big models or a full build plate; lower lift speed to below 40 mm/min. | Manufacturer recommendations, not universal settings. Verify the exact printer and resin profile before applying them. Phrozen guide. |
| ELEGOO, article dated November 24, 2020 | Suggests 70–75 seconds of bottom exposure for a large or heavy model in the article’s original-Mars context. | Do not generalize this legacy machine-specific recommendation to other models, resins, or screens. Follow the official resin setting sheet for other models. ELEGOO guidance. |
These recommendations are not interchangeable. Start from the profile specified for your own machine and resin. If adhesion still fails and the manufacturer’s guidance supports a change, adjust bottom exposure in small, recorded steps rather than jumping to a number from another printer. Change one setting at a time so the next result can tell you whether that adjustment helped.
Phrozen’s 20% recommendation is a relative change from a suitable baseline, not a fixed number of seconds for every resin. Likewise, the ELEGOO 70–75-second figure belongs to the context described on its original-Mars page. Do not combine the two recommendations or treat either as a universal starting point. If the maker’s profile does not call for a change, first rule out plate calibration, vat condition, and model-related causes.
Review lift behavior and other print settings
As layers separate from the vat film, the printer must lift the plate and peel the cured layer free. For a large print, the model’s area and geometry can increase the load placed on the print and its attachment points. Phrozen’s advice to lower lift speed below 40 mm/min is one manufacturer’s recommendation; it is not a default that can be assumed suitable for every machine. Check the printer and resin guidance before altering lift speed.
Rest time or light-off delay may also be part of a printer’s supported settings, but the appropriate value is machine- and resin-dependent. Do not change it simply because the plate adhesion failed. If your manufacturer recommends adjusting it for your setup, record the current value and make one controlled change at a time. Avoid changing exposure, lift speed, and delay together: if the next print succeeds or fails, multiple simultaneous changes make the cause harder to identify.
Keep a short settings log for each attempt: the printer model, resin and color, selected profile, bottom exposure, lift speed, any delay setting you changed, and the result. That record makes it easier to return to a known baseline and prevents a failed test from leaving you unsure which value was altered. It also gives manufacturer support the details needed to assess the setup.
Reduce stress on a large model’s first layers and supports
A large model needs a reliable connection to the plate and a layout that can withstand peeling forces as it prints. Formlabs identifies too little first-layer contact area and printing without a raft as possible causes of non-adherence; it recommends supports, a raft, and an orientation that provides adequate contact area. Apply that geometry guidance in the context of your own printer type and slicer.
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- Check raft and contact area: Make sure the model has an adequate base connection for its size and that the raft is actually included in the sliced job. A small contact patch can be an inadequate foundation for a broad or heavy print.
- Review orientation: Consider whether the model’s orientation creates a large cross-section that must peel from the film at once. A different orientation may reduce a suction-producing cross-section, but the best arrangement depends on the shape and printer workflow.
- Inspect supports: If the raft remains attached while the model separates, look for supports that are too weak, too sparse, or poorly placed for the model’s shape. This is a support failure, not evidence by itself that the build plate needs more exposure.
- Check hollowing and drainage: For a hollow model, review its internal geometry and drainage in the slicer. A trapped or suction-producing cavity can contribute to stress as layers peel. Use the printer and slicer guidance for a safe, printable design rather than assuming hollowing alone will solve adhesion.
Make one geometry or support change per test where practical. For example, if the raft detached, keep the model layout fixed while checking plate calibration and the profile; if the raft held but the model failed at the supports, revise support strategy before treating the plate as the culprit.
When reviewing a sliced model, check the full sequence of layers rather than relying only on the three-dimensional preview. Confirm that the raft and supports are present where expected and that the model’s orientation matches the plan. A large cross-section or cavity may create peel forces even when the base looks broad. The aim is not simply to maximize contact everywhere, but to use a supported, stable layout suited to the part and printer.
Account for temperature without guessing a universal target
Temperature can affect adhesion and exposure behavior. Phrozen lists inappropriate temperature as a possible cause, and ELEGOO notes that lower ambient temperature can call for an appropriate bottom-exposure adjustment. The available manufacturer guidance does not establish one safe target for every resin and printer combination. Use the temperature range and settings guidance for the exact resin and machine rather than applying a universal temperature or exposure correction.
If the printer is operating in a colder environment than the resin maker’s guidance anticipates, account for that as a possible contributing factor, not proof of the cause. Avoid compensating with a large exposure jump without checking the resin profile and printer recommendations. Note the environmental conditions when you test, so a change in the result is not mistakenly attributed only to a setting that changed at the same time.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use this troubleshooting order for the next attempt
- Stop and clear the vat. Wear gloves, remove cured debris with the printer maker’s recommended method, and inspect the release film for damage before another job.
- Classify the failure. A detached raft or cured patch on the film points to plate adhesion; a raft still on the plate with the object separated points to supports, geometry, or other print settings.
- Verify plate condition and Z calibration. Inspect for residue or unevenness and follow the exact model’s calibration procedure. Do not sand unless the manufacturer’s advice for that plate supports it.
- Confirm the matching profile. Check printer model, resin name and color, and profile compatibility. Use the resin and printer maker’s settings rather than copying an unverified exposure time.
- Make one supported adjustment. If appropriate for your printer and resin, test a modest bottom-exposure change or the manufacturer’s lift-speed guidance. Record the setting changed and leave unrelated values alone.
- Revisit the model if the base holds but the object fails. Check raft contact area, orientation, support strength, hollowing, drainage, and suction-producing geometry in the sliced model.
- Escalate with useful evidence if it persists. Photograph the plate, vat, failed raft, and sliced model. Send those images with the printer model, resin name, profile and settings, and environmental conditions to the manufacturer’s support team.
For a useful test, preserve the variables that are not under investigation. For example, after confirming a clean vat, a correctly calibrated plate, and a matching resin profile, make one manufacturer-supported change and run the same model or a comparable test. If the failure pattern changes, that is useful evidence; if it does not, restore the prior value before moving to another cause. This disciplined sequence avoids turning a single failure into a stack of unrelated setting changes.
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When contacting support, include clear photographs from more than one angle if possible: the build plate, the vat and film, the failed raft or model, and the sliced layout. Add the printer model, resin name and color, profile and relevant settings, and environmental conditions. Those details help support distinguish a raft-level detachment from a support failure or a curing problem.
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Handle cleanup and print removal safely
Liquid resin can contact skin during cleanup, so wear gloves and follow the resin’s safety instructions. For print removal, consult the printer’s procedure and use tools appropriate to the build plate; do not transfer that tool choice to the vat film. Phrozen’s print-removal guidance discusses removing prints from the build plate. If warming a plate to release a print, Phrozen says not to exceed the resin’s glass-transition temperature. Check the resin safety data sheet and the exact printer manual before using heat.
Cleanup and adhesion troubleshooting are separate tasks. A scraper or other tool used on a plate should not be assumed safe for the flexible vat film, and warming a plate is a print-removal measure rather than a way to improve the next print’s first-layer bond. Follow the printer manual and resin safety information for both operations.
Frequently Asked Questions
Why is my resin print stuck to the FEP or release film instead of the build plate?
A bare plate with a flat cured patch on the vat film indicates that the print detached from the platform. Check for cured debris or film damage, verify plate condition and Z calibration using the printer’s procedure, and confirm that the resin profile matches your printer and resin. Then review bottom exposure and lift speed only against the manufacturer’s guidance for that setup.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallShould I increase bottom exposure for a large resin print?
Possibly, but use the profile for your exact printer, resin, and color as the baseline. Phrozen’s general guide recommends increasing bottom exposure by 20% for big models or a full build plate, while cautioning that settings are machine-specific. ELEGOO’s 70–75-second suggestion is for a large or heavy model in the original-Mars context and should not be copied to other machines.
Should I sand my resin printer’s build plate?
Not automatically. Phrozen suggests 80-grit sandpaper as an option for an overly smooth plate, but sanding changes the surface and is not established as suitable for every model. Check the printer maker’s guidance for your specific plate before abrading it; if the manufacturer does not recommend it, leave the surface unmodified.
What if the raft sticks but the model separates from the supports?
That pattern points away from a basic plate-leveling problem. Inspect support strength and placement, model orientation, hollowing and drainage, and any suction-producing cross-section. Adjust the support or geometry issue rather than assuming more bottom exposure will solve it.
Can cold room temperature cause a large resin print to lose adhesion?
Temperature can be a contributing factor. Phrozen lists inappropriate temperature as a possible adhesion cause, and ELEGOO notes lower ambient temperature can call for an appropriate bottom-exposure adjustment. Neither establishes one safe target for every printer and resin, so follow the specific machine and resin documentation.
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What should I check before starting another print after a failure?
Remove cured resin or debris from the vat using the printer maker’s recommended method, inspect the release film for damage, classify whether the raft or the supported model failed, and check the plate and Z calibration. Confirm the resin profile before adjusting settings. Wear gloves around liquid resin, and do not use a metal tool on the vat unless the printer maker says it is safe.
The Bottom Line
First determine whether the raft detached or the model failed at its supports. Clear and inspect the vat, verify the plate and Z calibration, and confirm the resin profile before making a controlled settings or geometry change. Use model-specific manufacturer guidance—there is no universal exposure time, lift speed, sanding step, or temperature for every large resin print.
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