A simpler version of Models like Calistar or Califlake, but with Dimensions of a Calibration Square, like the Klipper Skew Correction Model but with Caliper Stops and two sided Measurements. It works without a spreadsheet and you only need to average the inner and outer Measurements along the Axis or Diagonal. You can put those values directly into the Klipper Skew Correction Config. The different Versions just have more rounded Corners for a somewhat smaller Print Area.