<s>[INST] My 3D prints are warping at the corners. I am printing in PLA with a 60 degree celsius bed temperature and a 210 degree celsius nozzle with no enclosure and 25 degree celsius ambient air. I am printing on a textured PEI build plate with a properly set first layer height. How can I fix the warping problem? [/INST] Warping is a common problem in 3D printing and can be caused by a variety of factors, including bed adhesion, temperature, and material properties. Here are a few tips that might help you reduce or eliminate warping:

1.    Increase bed adhesion: Try applying a glue stick or hairspray to the build plate to improve bed adhesion. Another option is to use a 3D printing surface like BuildTak or Kapton tape to provide a better surface for adhesion.

2.    Control temperature: Warping can be caused by rapid cooling of the plastic, which can cause the corners to contract and lift from the bed. Try increasing the bed temperature by a few degrees or using a bed enclosure to regulate the temperature and reduce the amount of cool air hitting the print.

3.    Adjust material properties: Experiment with using a slower printing speed, smaller layer heights, or higher infill percentages to reduce the amount of material laid down at once. This can help to reduce the amount of warping by allowing the material to cool more gradually.

4.    Brim or raft: Consider adding a brim or raft to your print, which will provide additional material for the corners to adhere to, reducing the likelihood of warping.

5.    Calibrate your bed: Make sure your bed is level and properly calibrated. A tilted bed can cause the corners to lift and warp.

Try these tips one at a time and see if they help reduce the warping in your prints. If you're still having trouble, you may need to experiment with different combinations of these techniques or try a different printing material. </s>