PLA warping is what happens when a PLA print shrinks a little as it cools and pulls its corners off the bed. The edges curl up, and in a bad case the part pops loose. PLA warps the least of the common filaments, so when it does warp, the cause is almost always a bed that is too cold or dirty, or a draft on the print. Prusa’s warping guide and the IC3D PLA datasheet point there.
Because PLA shrinks little, the fix is simple: a warm, clean bed and a brim. Work the list in order and reprint the same model after each fix.
PLA holds at a bed around 55 to 60 C, far less heat than ABS needs.
Where the fault comes from
| Likely cause | Fix | Severity |
|---|---|---|
| Bed too cold | Set the bed to 55 to 60 C, the range PLA needs to stay stuck. | hi |
| Bed dirty | Wipe the sheet with isopropyl alcohol so the corners grip. | hi |
| Drafts | Move the printer out of airflow so one side does not cool faster. | md |
| No brim | Add a brim so the first layer has a wider, stickier footprint. | md |
| Part cooling too high too early | Delay the part fan for the first layers so the base stays warm. | lo |
Start with these fixes
Print a small PLA part with wide corners, then work top to bottom and reprint after each step.
Raise the bed
Set the bed to 55 to 60 C so the PLA grips the sheet.
Clean the sheet
Wipe the sheet with isopropyl alcohol so the corners bond clean.
Block drafts
Keep the printer out of open airflow, since a cool draft on one side lifts that corner.
Add a brim
Turn on a brim so the first layer has a wider footprint that resists lifting.
Deeper fixes when the quick ones fall short
When the bed and the brim do not hold the corners, the cooling and the layer setup are next.
Delay the part fan
Keep the part fan off for the first few layers so the base stays warm.
Raise the nozzle temp
Add a few degrees to the nozzle so the first layer bonds hotter to the sheet.
Slow the first layer
Drop the first layer speed so the PLA has time to bond before it shrinks.
How PLA differs
PLA shrinks the least of the common filaments as it cools, so it warps the least, and it almost never needs an enclosure. PETG warps more and wants an 80 to 90 C bed, and ABS and ASA warp the most and need a hot bed plus an enclosure. The trade is that PLA softens low, so it cannot take heat in the finished part the way PETG or ABS can.
Mistakes that lift the PLA corners
A few choices invite the warp right back.
Avoiddo not
- Printing PLA on a cold bed, below 50 C.
- Running the part fan from layer one on a wide, flat part.
- Skipping the brim on a part with sharp corners.
- Leaving the printer in a cold draft.
Key takeaways
- PLA warps the least, so a lift means a cold or dirty bed, or a draft.
- Set the bed to 55 to 60 C, clean it, and add a brim first.
- PLA almost never needs an enclosure.
- Change one thing and reprint the same part.
For the general version, the warping guide covers any filament, and the PLA hub covers the material in depth.
Related guides
Related
More in this area
Cross-reference
Sources & methodology
3 citations · reviewed 2026-07-10- 01Bambu Lab PLA Usage Guide (wiki): PLA bed temperature and shrinkageaccessed 2026-06-29Tier 1
- 02IC3D Standard PLA Technical Data Sheet (TDS PDF)accessed 2026-06-29Tier 1
- 03Prusa Knowledge Base: Warping (shrinkage, adhesion, bed temp)accessed 2026-07-09Tier 1