Quick diagnosis
A resin print that comes off the build plate looking twisted, bowed or curled at the edges, while it stayed attached the whole time, is a warping problem, not an adhesion problem. That is a different fault than a print that lets go of the plate entirely, which is covered in Fix Resin Prints Not Sticking to the Build Plate. Warping comes from uneven curing stress inside the part itself, and the fix depends on which stage introduced that stress.
1. Rule out plate leveling first
An unlevel build plate does not just cause adhesion failures. It also causes uneven exposure across the first layers, since one side of the plate sits closer to the light source than the other. That imbalance builds asymmetric internal stress into the base of the print before you have even reached the model’s real geometry, and it shows up later as warping at the bottom edges. Run the paper-drag leveling check described in the plate-adhesion guide before changing anything else. If the plate has deep scratches or visible wear, replace it. A textured plate, the checkerboard-style surface used on several Anycubic and Elegoo models, distributes those first-layer stresses more evenly than a smooth one.
2. Fix the bottom layers, then the rest
Warping usually starts at the base, where the print has the least material to resist the pull between layers as each one cures and shrinks slightly against the one below it. Weak bottom layers cannot resist that stress, so the base curls first and drags the rest of the model with it.
- Increase bottom exposure time. A common working range is 30 to 40 seconds per bottom layer depending on resin and screen type, adjusted in small steps of 0.5 to 1 second so you are not guessing blind.
- Increase the bottom layer count. Going from the default 4 or 5 layers to 6 or 8 gives the base more total cured thickness to resist curling before the model transitions to normal layers.
- For larger, flatter models specifically, some printer makers recommend adding roughly 20 seconds of bottom exposure and 5 extra bottom layers; smaller models need less, closer to 10 seconds and 3 extra layers.
Do not confuse this with overexposing the whole print. Overexposure across every layer, not just the bottom ones, builds up its own stress as resin cures faster and harder than the design intended, and that is a separate cause of warping covered in the next section.
3. Watch for overexposure, not just underexposure
It is tempting to assume more exposure always means a stronger, safer print. Past a certain point it does the opposite. Overexposing resin makes it cure too quickly and too hard, which builds internal stress the same way underexposed bottom layers do, just from the other direction. If bottom-layer adjustments from step 2 do not help, or if the print is warping evenly across its whole body rather than just at the base, check normal-layer exposure against the resin manufacturer’s published starting point rather than a generic default, and step it down in small increments if it is running high.
4. Change the model’s orientation on the plate
Warping is worse on large, flat surfaces printed parallel to the build plate, because each layer across a big flat area has more surface pulling against the one below it, and that force is what curls the edges upward. Tilting the model 15 to 30 degrees off the plate reduces the flat contact area per layer and cuts down the peel force during each lift cycle. This is standard practice for anything with a wide flat base or panel, not just parts that have already warped once.
5. Keep the room temperature steady
Resin cures differently at different temperatures, and a workspace that swings between cold mornings and a warm afternoon, or sits near a draft, changes how consistently each layer sets. Keep the printing environment in a steady 20°C to 25°C (68°F to 77°F) range rather than letting it drift. This matters more for printers without a heated chamber or enclosure, since an open build area picks up ambient temperature changes directly.
6. Hollow and drain large models
A solid model uses more resin, weighs more, and holds more internal stress as it cures than a hollowed version of the same shape. For anything beyond a small figure, hollow the model in your slicer and add drain holes so uncured resin trapped inside can escape during and after printing. Resin left sealed inside a hollow model keeps curing slowly after the print finishes, and that ongoing internal cure is a documented cause of cracking and warping that shows up hours after the print looked fine.
Resin warping checklist
- Plate leveled with the paper-drag test, not just visually checked.
- Bottom exposure time and bottom layer count increased for large or flat models.
- Normal-layer exposure checked against overexposure, not assumed safe just because it is high.
- Model tilted 15 to 30 degrees rather than printed flat against the plate.
- Room temperature held in a steady 20°C to 25°C range.
- Larger models hollowed with drain holes added.
If the print is not warping but simply will not stay on the plate at all, or comes loose from the vat film instead, see Fix Resin Prints Not Sticking to the Build Plate and Fix Resin Prints Stuck to the FEP instead.