To prevent TPU from warping during 3D printing, here are several strategies you can try:

1. Improve Bed Adhesion:

2. Control Cooling:

3. Adjust Print Settings:

4. Filament Condition:

In summary, to stop TPU from warping, focus on good bed adhesion, controlled cooling, optimized print settings, and using dry filament.

Which of these areas would you like to focus on first, or is there anything specific about your setup that might be relevant?