Need more information. Why no glue? Please show photo - "warping" means different thing to different people. Is it sticking to the bed fine but warping later? Or is it lifting off he bed?
A photo would help. What material? ABS? PLA? What printer? Do you have a heated bed?
What material? What temperatures? what settings? What slicer?
I'm guessing ABS? In that case , keep the heat in your machine! First try with some cardboard and some sticky tape for the front, and try to close the top too
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