The four-point printer bed is over-constrained.
Maintaining a normal Z vector to the bed plane is complicated by comparison to a three-point mount.
Thermal expansion at 200 to 300°C may bind the four mounting screws.
Implementing a kinematic mount to mitigate this is less difficult with fewer mounting points.
Solution
[ ] Adopt a three-point bed slinger design e.g., Gulf Coast Robotics [RIP] and Precise Printer Parts.
Problem
The four-point printer bed is over-constrained. Maintaining a normal Z vector to the bed plane is complicated by comparison to a three-point mount. Thermal expansion at 200 to 300°C may bind the four mounting screws. Implementing a kinematic mount to mitigate this is less difficult with fewer mounting points.
Solution