Heat Bed Warping Calibration Print
thingiverse
If you measured every corner and center and discovered warps? With this print you can test which part you have warp and use thin objects to make it perfect. I saw several test for this case but I made my own quickly on Fusion 360. After several runs I could print a 15x15cm print without problem after this print and using 2x2cm (or post-it) to fix the warp.
Download Model from thingiverse
With this file you will be able to print Heat Bed Warping Calibration Print with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Heat Bed Warping Calibration Print.