3D print warping happens when plastic cools and shrinks faster than the bed can hold it down. Here's how to stop corners from lifting — by material, with the specific bed temps, enclosure tactics, and brim settings that actually work.
3D print warping happens when plastic cools and shrinks faster than the bed adhesion can hold it flat. The corners lift first because they cool fastest, and once a corner peels up, the next layer pulls on it, and the warp grows upward through the print. The fix is almost always thermal: keep the part warm enough during printing that it doesn't shrink unevenly. Bed temperature, an enclosure, fan settings, and a brim are the four dials that solve nearly every warping problem.
This article walks through why warping happens, the specific material-by-material settings that fix it, and how to know when you need an enclosure vs. when you don't.
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Quick summary
The four fixes that resolve almost all warping, in order:
- Raise bed temperature to the top of the material's range (PLA 65°C, PETG 80°C, ABS 110°C).
- Enclose the printer for ABS, ASA, polycarbonate, and large PETG prints. Even a passive cardboard enclosure helps significantly.
- Turn off or reduce the part-cooling fan on the first 3–5 layers, and reduce it overall for ABS.
- Add a brim — 5–10 mm wide, with mouse-ears on small contact points.
If the corners still lift after all four, the problem is filament shrinkage that no consumer printer can hold flat (or a print model that's geometrically prone to warping). The rest of this article unpacks each fix in order and explains when to escalate.
What is 3D print warping?
Warping is a category of failure where the bottom of a 3D print pulls upward off the build plate during printing. Most often it shows up as corners lifting away from the bed, but it can also appear as:
- A bowed bottom face that's no longer flat against the build plate
- Cracks or splits between layers, especially near the bottom
- A print that detaches entirely partway through and gets dragged around the bed
- "Elephant's foot" reversed — the bottom is narrower than the upper layers because it shrunk inward as it cooled
The visible warp is the result of an invisible internal stress. As each layer cools from melt temperature down to bed temperature (and then further to room temperature), the plastic contracts. If every part of every layer cooled at exactly the same rate, the print would shrink uniformly and stay flat. In practice, the corners and outer walls cool faster than the interior, so they shrink first, while the still-warm interior holds them in place. Eventually the corner's pull is stronger than the bed can resist, and the corner lifts.
Why does 3D print warping happen?
Three physical factors set up the warp:
Thermal contraction. Plastics shrink as they cool, by roughly:
- PLA: 0.3–0.5%
- PETG: 0.5–0.7%
- ABS: 0.8%
- ASA: 0.6–0.7%
- Polycarbonate: 0.6–0.8%
- Nylon: 1.0–1.5%
A 0.8% contraction sounds small, but on a 200 mm wide ABS part, that's 1.6 mm of pull at every corner. That's far more force than any glue stick can resist if the corner cools while the rest of the part is still hot.
Uneven cooling. Edges and corners radiate heat in two directions (top and side), while interior areas only radiate in one direction (top). They cool faster. The faster a section cools, the more it contracts before its neighbors, and the more force it pulls on the bond to the bed. Drafts from open windows, AC vents, or even the part fan blowing on the wrong area accelerate this dramatically.
Bed adhesion limit. Whatever sticks the print to the bed has a finite shear strength. PLA on textured PEI can hold maybe 5–10 N per cm² before releasing. ABS contraction at the corner of a 200 mm wide print can easily exceed that.
If you understand those three, the fix list becomes obvious: keep cooling rates uniform (enclosure, lower fan), keep contraction-while-printing low (raise bed temp so the underside stays warm), and increase the area of the bond (brim, larger first layer width). You can't change material chemistry, so the fight is always managing temperature gradients.
How to fix 3D print warping
These are listed in order of leverage. Most warping problems clear up at step 2 or 3 once you've covered step 1.
1. Raise bed temperature to the top of the range
Bed temperature is the single most-leveraged setting for warping. The hotter the bed, the more the bottom layers stay above the plastic's "freezing" point — the temperature below which the plastic stops being plastic and starts being glassy and rigid. Below the glass transition, the plastic actively shrinks. Above it, the plastic stays compliant and lets adjacent layers shift without ripping the bond.
Manufacturer-recommended bed temps are conservative. Try the upper end:
- PLA: 60–65°C (manufacturer often says 50–60)
- PETG: 75–85°C (manufacturer often says 70–75)
- ABS / ASA: 100–110°C (anything below 100°C is unreliable)
- Polycarbonate: 110–120°C
- Nylon: 70–90°C, depends heavily on brand
- TPU: 50–60°C — TPU rarely warps, but a warm bed prevents lift on tall prints
Above the ranges above you risk "elephant's foot" (bottom layers squishing outward as the plastic stays soft for too long). If you're at the top of the range and still warping, the next four steps below are where the leverage is.
A note on bed temperature drop near the corners: many heated beds run 5–10°C cooler at the corners than at the center, even when the printer reports a uniform temperature. If your warp is consistently at one specific corner, point an infrared thermometer at the bed corners during a print. If one is significantly cooler, that's why parts lift there. Aluminum heat-spreader plates and silicone heater mats both reduce this gradient; some printers ship with one, some don't.
2. Enclose the printer
For ABS, ASA, polycarbonate, and large PETG prints, an enclosure is the difference between a warped failure and a clean part. The enclosure keeps the air around the print warm — typically 35–50°C ambient — which dramatically reduces the temperature gradient between the cooling part and its surroundings.
You don't need a fancy enclosure to start. A passive enclosure that just blocks drafts and traps the heat the bed and motors already produce is enough for most ABS prints up to ~150 mm. Options ranked by cost:
- DIY cardboard / foam-board box. Free or near-free. Cut to fit around your printer with one cutout for the spool feed. Holds 30–35°C ambient with the printer running. Surprisingly effective for small ABS parts.
- IKEA Lack table enclosure. Two stacked Lack tables with acrylic side panels and a door. Around $80 in parts. Holds 40–45°C ambient. The classic budget upgrade and still one of the best enclosures available at any price for printers that fit inside it.
- Branded enclosure tents. 3D printer enclosure tent fireproof — fabric-and-frame tents that wrap most consumer printers. Around $50–80. Less rigid than acrylic enclosures but easy to set up and break down.
- Built-in enclosure. Bambu Lab P1S, X1, and the Bambu A1 don't quite have full enclosures by default but are designed for accessory walls. Prusa MK4 / Core One ships with a CPE wall option. Creality K1 Max and similar high-end consumer printers include enclosures.
For ABS without an enclosure, expect warping on any part larger than about 80 mm in the longest dimension. There is no slicer setting that fully compensates for an open-frame printer trying to print ABS. If ABS is your priority, build the enclosure first.
A word on PLA in an enclosure: PLA does not benefit from an enclosure. PLA's glass transition is around 60°C, and a 40°C enclosed environment can soften PLA enough to cause sagging on tall thin walls and to clog the heatbreak above the hotend. Open the enclosure or remove the door for PLA.
3. Turn off (or reduce) the part-cooling fan
The part-cooling fan blows air directly onto freshly extruded plastic to make it freeze quickly so the next layer can be deposited on top. That's exactly what you don't want for warping-prone materials.
Material-specific fan settings:
- PLA: 100% fan after layer 3. Fan off on layers 1–2. PLA warps less, and aggressive cooling helps with overhangs and bridging.
- PETG: 30–50% fan after layer 3. Fan off on layers 1–3. More fan than this can cause warping and layer adhesion issues.
- ABS / ASA: 0% fan, ever. The part needs to stay hot long enough for layers to bond and the part as a whole to cool uniformly. Most ABS profiles ship with fan disabled by default.
- Polycarbonate: 0–10% fan. Same reasoning as ABS.
- Nylon: 0% fan, sometimes 10–20% on overhangs only.
The "first few layers fan off" rule applies to all materials, not just warpers. Air blowing across the first few layers cools them before they can bond to the bed and to each other. If your slicer profile is configured with the fan starting on layer 1, that's a common silent cause of adhesion problems that look like warping.
4. Add a brim, mouse ears, or a raft
A brim is a single-layer skirt directly attached to the print's bottom edge that increases bonded surface area. A 5–10 mm brim is the default insurance for any print prone to warping. It costs almost no time or material and converts borderline prints into reliable ones.
For prints with very small contact points (like a tower with thin legs), use mouse ears — small flat disks added to the corners that act as local brims at the most-likely-to-lift spots. Most slicers don't add these automatically, but you can model them into the part as small chamfered cylinders, or download "brim helper" disks and arrange them around the corners.
A raft is a multi-layer base the print builds on top of. Rafts are heavier than brims (more time, more material) but stronger. Use a raft when:
- The print's footprint is too small for a meaningful brim
- The bed itself is uneven or damaged in the print area
- You're printing nylon or another material where bare-bed adhesion is unreliable
Tune brim width, not just on/off:
| Print scenario | Brim width | Notes |
|---|---|---|
| Small PLA part on clean PEI | 0 mm | Not needed; clean bed handles it |
| Tall PLA part with small footprint | 5 mm | Insurance against late-print lift |
| PETG of any size | 5 mm | Default. Add glue stick as a release barrier |
| ABS / ASA in an enclosure | 5–10 mm | Even with an enclosure, a brim is cheap insurance |
| ABS / ASA without enclosure | 10–15 mm or use raft | If you can't enclose, escalate |
| Nylon or PC | 10 mm + raft | Nylon almost always wants a raft on hobbyist printers |
Don't go above 15 mm. Past that, the brim itself starts to warp, and it doesn't help if the brim is what lifts.
5. Use the right bed surface for the material
Surface choice is covered in detail in the bed adhesion guide, but warping-relevant points:
- Smooth PEI holds PLA and PETG well, but PETG bonds aggressively enough that ripping a chunk of PEI off when removing a part is common. Use a glue stick layer for PETG.
- Textured PEI is the default for most users. Works well for PLA, PETG (with glue), and ABS in an enclosure.
- Glass with adhesive is the classic ABS choice. Glass plus Magigoo original 3D print bed adhesive or a thin layer of Aqua Net hairspray Extra Super Hold holds ABS at corners far better than bare PEI.
- Garolite (G10) sheet is the answer for nylon. Nothing else reliably bonds with nylon.
A surface mismatched to the filament is the most common cause of "warping" that's actually adhesion failure. If a corner pops loose at layer 2, that's adhesion. If a corner gradually pulls upward over 50+ layers, that's true warping (thermal contraction beating the bond over time). The fix is the same — increase adhesion, reduce contraction — but knowing which is dominant tells you where to focus.
6. Slow down the first 3–5 layers
Faster prints generate more uneven cooling because each layer has less time to bond before the next one is deposited. For warping-prone prints, slow the first few layers and the outer walls.
- First layer speed: 15–25 mm/s
- Layers 2–5: 30–40 mm/s
- Outer wall (whole print): 30–50 mm/s
The interior infill can run as fast as your printer is capable of without affecting warping much. The cooling that matters happens at the outer walls and the bottom layers.
A particularly effective tactic: print the first 5 layers slow and with fan disabled, then let the rest of the print speed up. This gives the foundation time to settle into a strong bond before the rest of the print starts pulling on it.
7. Manage the room
Drafts and ambient temperature swings cause warping that no slicer setting can fully fix.
- Don't print near an open window, especially in cold months
- Don't point a fan or AC vent at the printer
- Don't open a garage door during a long print (the temperature drop can crack ABS prints mid-build)
- Keep the print area at 20°C+ if possible
A cold room makes everything harder. ABS in a 15°C garage will warp on parts that print fine in a 22°C office, even with the same bed temperature and enclosure.
Material-by-material warp tolerance
Different materials want very different setups. A summary you can scan:
| Material | Bed temp | Part fan | Enclosure needed? | Brim | Adhesion |
|---|---|---|---|---|---|
| PLA | 60–65°C | 100% after L3 | No (and don't enclose) | Optional | Clean PEI |
| PLA+ / Tough PLA | 60–65°C | 80–100% after L3 | No | Optional | Clean PEI |
| PETG | 75–85°C | 30–50% after L3 | Helpful for large parts | 5 mm | PEI + glue stick |
| ABS | 100–110°C | 0% | Yes — required for parts >80 mm | 10 mm | Glass + Magigoo, or textured PEI |
| ASA | 100–110°C | 0% | Yes | 10 mm | Glass + Magigoo |
| Polycarbonate | 110–120°C | 0–10% | Yes — heated chamber preferred | 10 mm + raft | PC sheet or PEI + Magigoo |
| Nylon | 70–90°C | 0% | Helpful | 10 mm + raft | Garolite + glue |
| TPU | 50–60°C | 30–50% | No | Optional | PEI |
| PLA-CF | 60–65°C | 80–100% | No | 5 mm | Clean PEI, hardened nozzle |
| PETG-CF | 75–85°C | 30–50% | Helpful | 5 mm | PEI + glue, hardened nozzle |
If you're trying to print one of the warping-prone materials (ABS, ASA, PC, nylon) on an open-frame printer in a cold room with no enclosure, you're working against physics. The honest answer in that situation is to either build an enclosure or switch materials.
What you may need
A short list of products that genuinely help with warping. We earn a small commission if you buy through these links at no additional cost to you.
- Magigoo original 3D print bed adhesive — the canonical adhesive for ABS, ASA, and stubborn PETG. There are dedicated formulas for nylon and PC.
- Elmer's Disappearing Purple glue stick — cheap, reliable, doubles as a PETG release barrier.
- 3D printer enclosure tent fireproof — for users without space or skills for an IKEA Lack build.
- reflective insulation foil bubble wrap — for DIY enclosures, lining the inside of a wood or cardboard enclosure to retain heat.
- digital indoor thermometer — measure your enclosure's actual ambient temperature. Without measurement you're guessing.
- 99 percent isopropyl alcohol — cleaning the bed before any anti-warp print is the prerequisite step.
- Aqua Net hairspray Extra Super Hold — the classic ABS-on-glass adhesive in the purple can.
How to prevent warping
Habits that pay off:
Calibrate your enclosure with a thermometer. "I think it's warm in there" isn't enough. Measure ambient temperature inside the enclosure during a print. ABS wants 35–45°C ambient; below 30°C you're going to warp.
Pre-heat before starting the print. Run the bed at print temperature for 5–10 minutes before the print starts. This warms the bed evenly (corners take longer to reach temperature) and warms the air inside any enclosure. Most slicers have a "preheat" gcode hook for this.
Print orientation matters. A long thin part oriented with its longest dimension along the X axis warps more than the same part rotated 45°. The corner most prone to warping is the one farthest from the bed's center (where bed heating is strongest). Reorient parts so the longest edge isn't parallel to a bed edge.
Start with material in spec. Wet ABS warps far worse than dry ABS, and wet PETG is essentially impossible to print without warping. If a print warps that didn't warp last week with the same settings, dry the filament before changing anything else.
Don't open the enclosure mid-print. Each open-and-close cycle drops the ambient temperature by 5–10°C, which is exactly the temperature swing that causes warping. If you must check on a print, peek through a window, not by opening the door.
When to give up and switch materials
There's a point at which the right answer is "stop trying to print ABS on this printer" rather than "tune harder." Recognize the situation:
- You don't have an enclosure and can't build one, and you need to print ABS or larger PC parts. Switch to PETG or PLA+. Modern PLA+ formulations rival ABS for most hobbyist applications and don't need an enclosure.
- The part is geometrically warp-prone (long, flat, thin) and can be redesigned with corners chamfered or split into smaller sub-assemblies. Redesign first.
- Your printer's bed can't reach the temperature the material wants. ABS at 90°C bed will always warp. Either upgrade the bed (most stock heaters can be replaced with stronger ones) or print the material on a different printer.
- You've worked through every step in this article and the corner still lifts on a specific part. The model itself may be the problem — a part with very thin walls and large flat areas may be inherently warping-prone.
There's no shame in switching from ABS to ASA (similar properties, slightly more forgiving) or to PETG (much more forgiving, similar visual finish on textured PEI). Pick the right tool for the printer you actually have.
FAQ
Why are my 3D print corners lifting?
Corners lift because they cool fastest and contract first while the rest of the print is still warm. The faster the cooling rate (cold room, drafts, fan blowing on the corner) and the higher the material's contraction rate (ABS > PETG > PLA), the more aggressively the corner pulls upward. The fixes are all about reducing the cooling rate at the corners: raise bed temp, enclose the printer, turn off the part fan, add a brim.
Will an enclosure fix all warping?
For ABS, ASA, and large PC prints, yes — an enclosure is essentially required and largely solves warping. For PLA and PETG on a normal indoor printer, an enclosure isn't necessary and can even hurt (PLA softens above its 60°C glass transition). The right answer is material-dependent.
Why does PETG sometimes warp even though everyone says it doesn't?
PETG warps less than ABS but more than PLA. On large flat parts (200+ mm), PETG will warp at corners if the bed is below 80°C, if the part fan is at 100%, or if the print is in a draft. The fix is the same as for any material: warmer bed, lower fan, brim, no drafts.
Can I print ABS without an enclosure?
For small parts (under 80 mm in the longest dimension), yes, with care: bed at 110°C, no part fan, in a draft-free 22°C+ room, with Magigoo or hairspray on the bed. For larger ABS parts, no — the contraction force overwhelms any consumer printer's bed adhesion. Build an enclosure or switch to ASA / PLA+.
Why does my print warp only on one corner?
Almost always uneven bed heating. Many heated beds run 5–10°C cooler at one corner than the rest, and that corner is where prints lift. Point an infrared thermometer at each corner during a print to confirm. The fix is either replacing the bed heater (some stock heaters have hot spots), adding an aluminum heat-spreader plate, or rotating the model so its corners aren't aligned with the cool spot.
What's the difference between warping and elephant's foot?
Warping pulls the corners upward because the part contracts as it cools. Elephant's foot pushes the bottom layers outward because the bed is too hot or the first layer is too low and the plastic stays soft long enough to spread. They're opposite problems with different fixes — warping wants more heat retention, elephant's foot wants slightly less bed temperature or a cooler first layer fan.
Does printing slower help with warping?
A little, mostly because slower prints have more uniform cooling. Slowing the first 3–5 layers helps significantly. Slowing the rest of the print past the first few layers helps less and isn't worth the extra print time on its own. The high-leverage moves are bed temp, enclosure, and brim — not slower print speeds.
How do I know if my filament is warping or my bed adhesion is failing?
Adhesion failures pop loose early — within the first 5 layers, usually all at once. Warping is gradual; the corner lifts a fraction of a millimeter per minute and you can see the gap grow over the first hour of a print. Adhesion problems are about the bond. Warping is about the force fighting the bond. Fix adhesion first (clean bed, Z-offset), then if the print still slowly lifts over time, it's warping and the steps in this article apply.
Can a brim cause its own warping?
Past about 15 mm wide, yes. A wide brim acts like a thin flat part of its own and can warp at its own outer edge, pulling the print's corner up with it. Keep brims in the 5–10 mm range. If you need more help than that, switch to a raft or escalate the other fixes (enclosure, bed temp).
If your warping problem doesn't match any of the cases here, snap a photo and run it through the WhyItFailed AI diagnosis tool. The free first diagnosis examines the specific lift pattern and tailors fixes to your exact printer, surface, filament, and ambient conditions. Often warping that looks identical from the outside has very different underlying causes.