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"cover_height_in_millimeter" is a preset value depending on the "fan_preset" value. To change the height, you have to set the value of "fan_preset" to "custom" (default: 40).
Then all values of the custom section influences the model:

  • cover_size_in_millimeter
  • screw_hole_diameter_in_millimeter
  • screw_hole_distance_in_millimeter
  • cover_height_in_millimeter
  • grill_pattern_height_in_millimeter

Make sure to change all the values to your needs. There are some hints above each parameter.