Use on a square Cartesian bed.

[mshievitz]

So far the best way I can figure to do this is using the 3 fsr pads under the bed using a maximum equilateral triangle solution or just inside the leveling screws one in each corner and one mid bed on the opposite edge...
It would be nice to be able to attach a 4th fsr and place them in each corner to reduce any possible cantilevered error due to areas probed outside a triangle within the square bed.

Is there a way to do this? Or should I just restrict the probe points to areas directly over the 3 sensors?