Warping and corners lifting
The corners or edges of the print curl up off the bed, so the bottom is no longer flat.
Also described as corners lifting, curling corners, edges lifting, warped, lifting off bed, bottom not flat
Try these in order
Most likely and quickest to check first. Change one thing at a time so you know what fixed it.
The print is cooling and shrinking too fast
Plastic shrinks as it cools. If the top of the print cools faster than the bottom, it pulls the corners up. ABS, ASA, nylon and PC are the worst for this.
- Print ABS, ASA, nylon and PC in an enclosure, and let it warm up for 10 minutes first.
- Keep the printer out of draughts from windows, doors and fans.
- Reduce or turn off the part cooling fan for warp-prone materials.
Not enough grip on the bed
- Clean the bed and check the first layer is squashed slightly.
- Add a brim of 5 to 10 mm, or mouse ears on sharp corners.
- Use glue stick for large flat parts.
Bed not hot enough
- Raise the bed temperature by 5 to 10 °C within the material's range.
Sharp corners on a large flat part
- Round the corners in your model, even a 2 to 3 mm radius helps.
- Rotate long parts so they're not along the line of a draught.