def make_save_string(file_name):
    """
    Returns a complete save string for saving a model.
    ======================================

    Input:
        file_name (string) - Filename used in save string.

    Output:
        save_string (string) - Save string for specified model.
    """
    
    # Filepath for saved file
    filepath = r'C:\Developer\electric_motor_thermal_modelling\Models'

    filepath_full = filepath + '\\' + file_name

    return filepath_full