You start a print, walk away, and come back to find the corners curled up off the plate like a potato chip. Sometimes the print survives with a wonky base. Sometimes it pops off entirely and you come back to a bird’s nest of filament welded to the nozzle.
Warping is the single most common failure I’ve dealt with across years of printing on Creality, Bambu Lab and resin machines, and the frustrating part is that most guides throw twenty “tips” at you with no sense of which ones matter. So here’s the honest version: warping has one cause and about five fixes, and two of those fixes solve maybe 80% of cases.
What’s Actually Happening
Plastic shrinks as it cools. That’s it — that’s the whole mechanism.
When the bottom layers of your print are held flat against a warm bed while the layers above them cool and contract, the upper layers pull inward. Something has to give. If the bond between the first layer and the build plate is weaker than that contraction force, the corners lift.
Two things follow from this, and they explain almost everything else:
- Corners lift first because they’re cooling from two directions at once. This is also why big flat parts warp far more than tall narrow ones, and why rounded shapes warp less than square ones.
- The more a material shrinks, the worse it warps. ABS shrinks a lot. PETG is in the middle. PLA barely shrinks, which is why PLA warping usually means something is genuinely wrong rather than just “that’s ABS being ABS.”
No setting eliminates shrinkage. Everything below is about either reducing the temperature difference across the part, or making the first layer grip hard enough to win the fight.
Fix It in Order
Work down this list. Don’t jump to the bottom — I’ve watched people buy an enclosure for a problem that was a greasy build plate.
1. Clean the build plate (do this first, always)
Skin oils are the number one cause of adhesion failure and it isn’t close. You handle the plate, you leave fingerprints, and PLA won’t stick to grease.
Wash the plate with warm water and dish soap, then dry it with a clean cloth. Not a wipe with a paper towel — actually wash it. Isopropyl alcohol works for a quick refresh between prints, but it smears oils around rather than removing them, so soap and water every few weeks regardless.
If you have a textured PEI plate, this is doubly true: the texture holds oil in the valleys where you can’t see it.
2. Fix your first layer height
A first layer that’s printed too high sits on the plate as a row of rounded tubes with gaps between them. Barely any contact area. Squash it slightly and those lines flatten into a solid sheet that grips.
You want your first layer lines to look like flat ribbons touching each other with no gaps — not spaghetti, and not so crushed that the nozzle leaves ridges or you get elephant’s foot.
On a Bambu machine, run the auto bed leveling and then nudge the Z-offset down in 0.02 mm steps until the first layer looks right. On a manual-leveling Creality, level it cold, then level it again at printing temperature — the bed changes shape as it heats.
3. Turn the bed temperature up
Bed heat keeps the lower layers soft enough that they can absorb some contraction instead of ripping off the plate.
Reasonable starting points:
| Material | Bed temp | Notes |
|---|---|---|
| PLA | 60 °C | 65 °C if you’re still lifting |
| PETG | 80 °C | Watch out for over-adhesion on smooth PEI |
| ABS/ASA | 100–110 °C | Enclosure basically required |
| TPU | 50–60 °C | Rarely warps — it’s too flexible to build up stress |
Adjust in 5 °C steps and give the bed a good five to ten minutes to actually stabilize before starting. A plate that just hit its target temperature is not evenly heated yet — the edges lag behind the center.
One warning on PETG: it bonds aggressively to smooth PEI, to the point where it can tear chunks out of the sheet on removal. Use a textured plate or a thin layer of glue stick as a release agent, not as an adhesive.
4. Kill the drafts
An open window, an AC vent, a door that opens into the room — any of these cools one side of your print faster than the other and creates exactly the temperature gradient you’re trying to avoid.
Move the printer somewhere still. This costs nothing and fixes more ABS problems than any slicer setting.
For high-shrinkage materials you eventually need a real enclosure. Not because of the setting, but because the machine’s thermal architecture is the limitation: an open-frame printer physically cannot hold a warm chamber. This is the honest reason a P1S handles ABS well and a P1P doesn’t — it’s the panels, not the firmware.
5. Reduce cooling on the early layers
The part-cooling fan is there to make overhangs and small details crisp. On the first few layers it’s actively working against you.
Set part cooling to 0% for the first layer and ramp it up gradually. For ABS and ASA, keep it near zero for the entire print. For PLA, full cooling after layer three or four is fine — PLA shrinks so little that the tradeoff favors detail.
6. Use a brim
A brim adds a flat skirt of material attached to your part’s base, adding surface area exactly where the lifting force is strongest.
A 5 mm brim handles most cases; go to 8–10 mm for tall, narrow or high-shrinkage parts. It leaves a small lip you’ll need to trim, which is a fair price for a print that doesn’t fail four hours in.
A raft does the same job more aggressively but wastes far more filament and usually leaves a rougher bottom surface. Brim first, raft only if the brim isn’t enough.
7. Change the geometry
Sometimes the model is the problem. If you’re printing something large, flat and square in a high-shrinkage material, you’re fighting physics with settings.
Options: round or chamfer the bottom corners, add “mouse ears” (small discs at each corner that act as anchors and snap off after), split the part and glue it, or reorient it so the largest flat face isn’t on the bed.
Can You Fix an Already-Warped Print?
Mostly, no. The deformation is locked in by the internal stresses, and anything you do to reshape it is cosmetic at best.
For a thin, light part you can sometimes heat it gently — a hair dryer, approaching but not reaching the material’s glass transition temperature — press it flat against a hard surface, and hold it there until it cools. Expect a warped-looking result with a slightly different warp.
For anything functional or dimensionally critical, reprint it. Diagnosing why it warped takes less time than fighting a part that’s already wrong.
Quick Diagnosis Table
| What you see | Most likely cause |
|---|---|
| Corners lift within the first few layers | Dirty plate or first layer too high |
| Print peels off entirely mid-print | Bed temp too low, or a draft |
| Only one side lifts | Draft from one direction, or uneven bed |
| First layer peels but upper layers are fine | Uneven plate heating — preheat longer |
| Corners curl the moment the fan kicks in | Cooling too aggressive too early |
| Glossy patches where lines won’t grip | Oil on the plate |
| PLA warping at all | Something’s genuinely wrong — start at step 1 |
The Short Version
Clean the plate. Get the first layer right. Raise the bed temperature. Stop the drafts. Add a brim.
If you do those five things, warping stops being a recurring problem and becomes an occasional one that shows up when you try something ambitious in ABS. Which, honestly, is where it belongs.
Related reading: PETG vs PLA: Which Is Better for Your Project? · Best PETG Filament in 2026