Warping is when a print’s corners or edges lift off the bed as layers cool and shrink. It is not the same as a nozzle that never stuck in the first place — though a weak first layer makes warp much worse. Fix adhesion and cooling for your material; there is no single trick that works for PLA, PETG, and ABS alike.
What warping looks like
- Corners curl upward while the centre stays down
- Long flat edges peel progressively through the print
- The part detaches mid-job and the nozzle ploughs plastic
- After cooling, the base is banana-shaped even if it finished
Why corners lift
Molten plastic shrinks as it solidifies. Upper layers contract while the first layer is locked to the bed, so stress concentrates at corners and long edges. Poor grip lets the edge peel; strong grip with extreme shrinkage can still crack the part or tear PEI coatings — tune process, do not only “glue harder.”
Bed adhesion (first check)
If the skirt never sticks, you do not have a warp problem yet — you have a first-layer problem. Clean the plate, set Z safely, and verify a solid first layer using the first-layer calibration guide before adding brims or enclosures.
Cooling and thermal contraction
Aggressive part cooling on large ABS/ASA footprints increases corner lift. PLA usually wants cooling after the first layers; engineering materials often need less fan and a warmer chamber. Lowering fan on early layers, raising bed temperature within the filament’s range, and slowing large solid bottoms can reduce stress — always stay inside manufacturer guidance (temperature guide).
Material differences
- PLA — low shrinkage; warps mostly from dirty beds, cold rooms, or huge flat bases
- PETG — moderate; watch over-bonding to PEI and drafts
- ABS / ASA — high shrinkage; enclosure and stable ambient air matter as much as glue
- Nylon / filled — often moisture + shrinkage; dry filament and controlled chamber help
Do not apply an ABS enclosure recipe to PLA “just in case,” and do not expect a PLA glue stick alone to tame large ABS panels.
Bed surface and cleaning
Match surface to material (textured PEI, smooth PEI, glass, etc. per your plate maker). Wash oils off before every critical job. Re-clean after a failed peel instead of immediately stacking adhesives.
Brim and other adhesion aids
A brim widens the footprint so corners have more plastic holding them down — remove it after printing. Rafts add a disposable base (more filament, more cleanup). Magigoo, glue stick, or specialty sprays can help when the plate and temps are already sane; they are not a substitute for Z-height. Mouse ears (small discs at corners) help some large squares without a full brim.
Enclosure and ambient conditions
Drafts from AC or open windows cool one side of the part faster and invite lift. An enclosure (or even a simple draft shield) helps ABS/ASA keep layer temperatures even. Avoid sealed chambers hotter than your filament and electronics can handle — follow printer and material docs.
Printable troubleshooting checklist
Related guides
Start with first-layer calibration. Whiskers between towers are a different failure mode — see stringing fixes. Temperature ranges by material land in the filament temperature guide.