Fixing warping and curling
Warping lifts the corners of flat parts and bends long ones. Heat and grip control it.
What you will see
- Corners lift off the bed during the print
- A long flat piece ends up bowed
- A gap under the edge of the first layer
What to try, in order
- Clean the plate with warm water and dish soap, and keep bare fingers off it afterwards.
- Bed temperature: textured PEI at about 55 to 60 °C for PLA; 70 to 80 °C for PETG (80 for small parts).
- Add a 3 to 5 mm brim.
- Slow first layer, about 25 mm/s.
- Keep drafts and cold air off the print; an enclosure helps.
Change one thing at a time and test with one piece, not a whole plate.
Good to know
- Large flat parts warp more than small blocks. Print fewer per plate if they keep lifting.
- If only the smallest pieces let go, read small parts lifting.
Where we give numbers, they come from our own tests on a Bambu P1S with a 0.4 mm nozzle plus advice from other makers, and other printers need small adjustments. Our print settings page has the full table. Printed bricks are not toys: small parts, a choking hazard, not for children under 3.