NOTE: The minimal version has been incorporated back into the original model: https://www.printables.com/model/413761-gridfinity-refined (along with generated STLs for all the various grid sizes)
Removes the central screw-down port and trims out as much extra material as possible. On a 4x5 grid reduces material 20% and decreases print time.
Based on https://www.printables.com/model/413761-gridfinity-refined
The author remixed this model.