Printbed Diagnosis Pattern

This Pattern is for investigating your printbed.
It shows:

1. It can help you to find spots of bad adhesion (in the image above on the right)
If your printbed has spots of bad adhesion you will see the difference while printing.

2. It shows the leveling of your printbed
After printing you will see, if the leveling is consistent.

3. It reveals the bending of your linear rails (compare the right side with the bottom left corner in the image above)
Some inconsistencies witch appears a