The mounts for the heated bed of the Anycubic Kossel have six support points. I've always found it challenging to ensure the heated bed rests evenly on all points. If a printed part was too firmly stuck to the plate and needed a bit of force to remove, it often caused the bed to shift. This small modification to the support design reduces the heated bed to resting on just three points. You lose about 2mm of printable height, which I've personally never needed. All you need are three of the printed parts and three 5mm steel balls.
Be careful not to touch the connections of the heated bed with the balls (this shouldn’t be an issue), and make sure to use the original fasteners.

Anycubic

Kossel

No

No

ABS