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Most Formlabs failures can be isolated to one of four stages: exposure and adhesion in the printer, model geometry and supports, washing, or curing and cooling. Start by identifying whether you are using an SLA/LFS printer (Form 2, Form 3/3L, or Form 4/4L) or an SLS system (Fuse), then change one variable at a time. Check the resin or powder, tank and optical path, build platform, orientation, supports, and post-processing before replacing parts.
The symptom usually points to the fastest check: a part that never sticks suggests a platform, tank, resin, or support problem; curved SLA/LFS parts often result from support, washing, or curing; SLS distortion is mainly thermal; peeling layers indicate exposure, contamination, or a long interruption; and holes or explosions usually mean a hollow model has no drainage path.
First identify the printer process
Do not apply an SLA/LFS fix to an SLS failure. The machines form parts differently and the same word—especially “warping”—describes different mechanisms.
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|---|---|---|
| Form 2, Form 3/3L, Form 4/4L | SLA or LFS resin printing | Weak exposure, poor platform contact, unsupported geometry, trapped resin, solvent swelling, and uneven post-curing |
| Fuse systems | SLS powder printing | Uneven thermal shrinkage, incorrect bed temperature, powder-cake handling, geometry, and dirty or inaccurate sensors |
Record the printer generation before troubleshooting. Generation affects tank, platform, resin, and software compatibility, so a part that fits one machine is not automatically suitable for another.
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A repeatable diagnostic workflow
Use this sequence for every failed or distorted job. It prevents several simultaneous changes from hiding the real cause.
- Record the symptom. Photograph the failed part as it sits on the platform or in the powder cake. Note whether the defect is detachment, warping, delamination, ragging, a hole, an internal explosion, or a layer offset.
- Record machine and material details. Write down the printer generation, resin formulation and lot, cartridge or powder age, layer thickness, and the material setting selected in PreForm or on the printer.
- Inspect consumables and contact surfaces. Check the resin tank, optical window, build platform, cartridge, and—on SLS systems—the powder bed, sensors, and powder-handling surfaces.
- Review the model. In PreForm, inspect orientation, supports, rafts, highlighted unsupported minima, wall thickness, drainage, and abrupt changes in cross-section.
- Change one variable. For example, add a raft without changing resin or layer thickness, or clean the tank without simultaneously changing orientation.
- Run a controlled print. Use the Formlabs test print or a small representative geometry. A successful test identifies whether the problem is machine-wide or limited to the original model.
- Document the result. Photograph the platform, support contact points, finished surfaces, and close-up defects. Keep the original and revised FORM files.
- Escalate with evidence. If the controlled test still fails, send the photos, printer serial name, material and lot, layer thickness, FORM files, previous attempts, and diagnostic logs to Formlabs Support or an authorized reseller.
Checks that should come before a new print
Resin, cartridge, and material setting
Confirm that the cartridge is within its stated service life and that the printer is using the correct resin formulation and layer-thickness profile. Formlabs support guidance states: “Formlabs resins last for 12 to 24 months in the resin cartridge, depending on the resin type.” That is a resin-type-dependent cartridge figure, not a guarantee for every opened bottle, tank, or printed part. Store and mix resin as directed for the material, and do not combine formulations unless the material documentation explicitly allows it.
Resin tank and optical surfaces
Look through the tank for cured flakes, clouding, scratches, fingerprints, or other damage. A small cured fragment can block a point of exposure; clouding or contamination can weaken exposure over a larger area. Inspect and clean the optical window and other optical surfaces using the procedure for your printer generation. Never continue printing when a damaged tank or contaminated optical path is the obvious common factor in repeated failures.
Build platform
The platform must be clean, correctly seated, and firmly secured. Resin, cured debris, or an incompletely tightened mechanism can prevent the first layers from bonding. If the platform is loose, the entire part may shift or detach even when the supports are correctly designed.
When nothing adheres or the part detaches
A clean, seated platform and an unobstructed tank are the first checks. Then distinguish a first-layer failure from a support failure.
Platform and tank checks
- Remove resin or debris from the platform and verify that it is installed and locked in its normal position.
- Inspect the tank for cured debris, clouding, fingerprints, or damage.
- Check cartridge age and selected material settings, then mix resin as directed.
- After cleaning, run a small controlled print rather than immediately attempting the full model.
Model and support checks
In PreForm, regenerate supports and resolve every highlighted unsupported minimum. Unsupported minima can break away during printing, producing structural defects, warping, a contaminated tank, or a resin spill. Increase touchpoint capacity where the part is heavy or where a broad surface begins to pull against the previous layer. Reorient long spans and large flat faces so that each layer grows progressively instead of presenting a sudden, high-force cross-section.
Form 4 Flex platform caution
On Form 4 Flex platforms, a large or nearly solid part printed directly on the surface can decouple from the platform. Use a raft and choose an orientation that distributes the load through supports rather than relying on a broad, direct contact area.
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Warped or curved SLA/LFS parts
Formlabs describes warping as a printed part having a different shape from the intended shape. Treat it as a stage-specific problem: printing, washing, or post-curing.
During printing: reduce deformation forces
- Add adequate supports and increase touchpoint capacity for heavy sections.
- Orient the model to reduce large unsupported spans and sudden cross-sectional changes.
- Avoid long, slender features that extend far from their support network.
- Check thin walls and unsupported minima in PreForm before generating the final file.
Orientation is an engineering control, not a cosmetic choice. A sudden increase in the area cured in one layer can pull against earlier layers; a long unsupported lever can bend at its support contacts. Changing the growth direction often fixes a distortion without changing resin or exposure.
During washing: prevent solvent swelling
Do not leave a resin part soaking longer than the workflow requires. Parts can absorb solvent and swell, with fine features affected first. Use the specified wash process, then allow the part to dry fully. A part that is still wet when it enters curing can change dimensions or develop a different stress state than a dry part.
During post-curing: make the cure uniform
Keep parts on supports when the workflow calls for support during curing, preheat as directed, and use the cure settings for the material. Large or thick parts, long thin features, and parts with fine details may require a different cure approach than a small solid test piece. Uneven heating or restraint can lock in curvature even when the print itself was dimensionally correct.
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SLS parts shrink as they cool. When different regions cool at different rates, the resulting uneven shrinkage produces curvature or twisting.
Geometry and placement
- Keep long, slender parts near the center of the build volume where thermal conditions are more uniform.
- Avoid non-uniform wall thickness where the design permits; thick and thin regions cool and shrink differently.
- Follow the current material print settings rather than borrowing a profile from another powder.
- Consider edge placement a risk factor when a part spans a region with a stronger thermal gradient.
Cooling and unpacking
Allow the powder cake to cool below 30 °C (86 °F) before unpacking. Removing parts while the cake is hotter can release thermal stresses unevenly and increase distortion. If a consistent geometry still warps after correct cooling and placement, the bed-temperature target may need tuning; that adjustment should be made deliberately and documented rather than changed repeatedly.
Delamination, ragging, and undercuring
Delamination
“Delamination” describes a defect in which cured layers separate from one another. Inspect the failed area and then check:
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- Whether the model is under-supported or oriented so that a large layer pulls away from the previous layer.
- Whether the platform is tight and the tank is clean, undamaged, and within its usable condition.
- Whether the resin is expired or the selected profile is wrong.
- Whether the print paused for an hour or longer, allowing an interruption between layers.
- Whether optical surfaces are contaminated or the tank contains cured debris.
After correcting the likely cause, run a controlled test. If layers still separate on a simple, well-supported test, treat the issue as a machine, tank, or optical-path problem rather than redesigning the original model indefinitely.
Ragging
Ragging appears as thin, shelf-like flaps or loose sheets. Check resin expiration, tank clouding or damage, optical surfaces, and cured debris first. Dense supports or an orientation that restricts resin flow can also leave partially formed material trapped between features. Reduce unnecessary support density, improve drainage around crowded regions, and verify the resin can flow freely as the part rises.
Holes, explosions, and internal failures
A hollow, unvented model can trap liquid resin. Pressure and trapped material can propagate a failure through the part, sometimes described as an “explosion.” Change the orientation and add a correctly positioned drainage hole so resin has a path out during printing and washing. Inspect the mesh in the modeling program when PreForm reports holes, missing surfaces, or abnormal geometry; a repair in the slicer cannot reliably correct every invalid mesh.
Layer shifting or offset prints
If layers shift consistently along the X axis on a Form 3-generation printer, debris or wear affecting the LPU movement may be involved. First secure the build platform and inspect the printer and optical path according to the procedure for that generation. Run a test print after cleaning and reseating components. If the offset returns, preserve the failed part and file, photograph the shift from several angles, and include the FORM file and diagnostic logs in an escalation.
Post-processing defects that resemble print failures
Separate a defect made in the printer from one introduced afterward. A correctly printed part can warp in washing or curing, while a weakly printed part may only become visibly damaged during those steps.
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- Wash stage: check for swelling, softened details, or dimensions that change after prolonged solvent exposure.
- Cure stage: check whether the part was dry, whether it was supported as required, and whether the cure setting matched its size and material.
- SLS cooling stage: check the powder-cake temperature and the time allowed before unpacking.
Photograph the part immediately after printing, after washing and drying, and after curing when a dimensional defect is difficult to localize.
Common troubleshooting pitfalls
Several habits make diagnosis slower or create a second failure. Changing resin, orientation, supports, layer thickness, and cure settings in the same attempt removes the comparison point. Make one deliberate change, record it, and retain the prior FORM file. Reusing a tank with a suspected cured fragment can repeat the same failure, while replacing a tank solely because a single model warped can waste a serviceable consumable. First determine whether the tank is merely dirty or visibly cloudy, scratched, or damaged.
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Do not assume every warped SLA/LFS part was distorted during printing. Compare its shape before washing, after drying, and after curing. Conversely, do not blame washing when a support detached during the build. On Fuse systems, do not unpack a hot powder cake simply to inspect a part sooner. Keep long slender geometry away from high-gradient edges, and check that powder-system surfaces and sensors are clean before changing the bed-temperature target.
Another frequent mistake is treating a highlighted unsupported minimum as optional. Those small regions can detach, contaminate the tank, and damage subsequent jobs. Resolve all such warnings or consciously redesign the geometry before printing.
A controlled test plan that isolates the cause
For an SLA/LFS machine, use a small, well-supported test model with the same resin and layer thickness as the failed job. If the test adheres and cures correctly, the printer and consumables are less likely to be the root cause; concentrate on the original model’s spans, wall thickness, drainage, and support contacts. If the test also fails, stop redesigning the part and repeat the tank, optical-path, platform, cartridge, and profile checks.
For SLS, use a representative geometry positioned near the center of the build volume and let the powder cake cool below 30 °C before unpacking. A center test that succeeds while an edge-positioned long part twists points toward thermal gradients or geometry. A test that fails across the build suggests a material-setting, sensor, powder-system, or bed-temperature issue. Keep the same powder and documented settings while comparing results.
Compatibility and replacement decisions
Match every replacement to the exact printer generation and material workflow. A resin tank, build platform, Flex platform, cartridge, or optical component intended for another Formlabs family may not be compatible. Verify the printer model, resin formulation, layer thickness, and current software or material profile before ordering. The strongest practical replacement check is condition: persistent clouding, scratches, damage, or repeated failures after proper cleaning justify stopping use and obtaining a compatible tank. A clean tank with removable debris should be serviced according to its care procedure and tested first.
There is no universal tank replacement interval or print-count rule. Tank life depends on condition, resin, layer thickness, cleaning history, and the pattern of failures. Keep a simple record of when a tank was installed, which materials it has seen, and which defects appeared. That history helps distinguish normal consumable wear from a model-specific support problem.
How to prepare an effective support request
A support team can act faster when it can reproduce the failure. Include:
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- Printer model and serial name.
- Resin formulation, cartridge or powder lot, approximate age, and selected material setting.
- Layer thickness and the original FORM file.
- Photos of the build platform, tank or powder area, supports, complete failed part, and close-up defect.
- A short timeline of what changed between attempts.
- Diagnostic logs and the result of the controlled test print.
State which variables were deliberately held constant. For example: “Same resin and layer thickness; cleaned tank; added raft; test cube succeeded, original geometry still detaches.” That distinction tells support whether to investigate the machine or the model.
Frequently Asked Questions
Why did my Formlabs print fail even though the supports look correct?
Check the platform seating, tank debris or clouding, optical surfaces, resin age, and selected material profile. A loose platform or weak exposure can defeat otherwise adequate supports. Run a small controlled test before changing the model again.
Why won’t my Formlabs print stick to the build platform?
Clean and firmly secure the platform, remove cured debris, inspect the tank, verify the resin and profile, and regenerate supports. On a Form 4 Flex platform, use a raft for large or nearly solid parts instead of printing them directly on the surface.
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Why is my Formlabs SLA or LFS part warped?
Separate printing, washing, and curing. Improve orientation and supports, reduce long unsupported spans, avoid extended solvent soaking, dry the part completely, and follow the material’s post-cure procedure. Keep the part supported during curing when that workflow requires it.
Why are my Fuse SLS parts warped?
Uneven thermal shrinkage is the usual mechanism. Keep long slender parts near the build-volume center, avoid abrupt wall-thickness changes, use the current material settings, and wait until the powder cake is below 30 °C (86 °F) before unpacking.
What causes delamination or ragging on a Formlabs printer?
For delamination, inspect supports, orientation, platform tightness, tank condition, resin age, optical contamination, and any pause lasting an hour or longer. For ragging, also check tank clouding, cured debris, and whether dense supports or crowded geometry restrict resin flow.
When should I replace a Formlabs resin tank?
Replace it when persistent clouding, scratches, damage, or repeated failures remain after proper cleaning and a controlled test. There is no single print-count interval; confirm compatibility with the printer generation and resin workflow before ordering.
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Can a hollow model cause a Formlabs print to explode?
Yes. An unvented hollow model can trap liquid resin and propagate an internal failure. Reorient it and add a correctly positioned drainage hole, then inspect and repair abnormal mesh geometry in the modeling program.
What should I send Formlabs Support for a recurring failure?
Send the printer model and serial name, resin or powder formulation and lot, age, layer thickness, material setting, original FORM files, photos of the platform, tank or powder area, supports and defect, prior attempts, and diagnostic logs.
The Bottom Line
Diagnose the stage before changing the setting. For SLA/LFS, start with resin, tank, optical surfaces, platform, orientation, supports, washing, and curing. For SLS, start with geometry, placement, bed temperature, powder-system cleanliness, and cooling below 30 °C before unpacking. Change one variable, run a controlled test, document the result, and escalate with complete evidence when the failure persists.
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