Figure 1 – A) The figure shows the computed tomography (CT) scan image of one of the horseshoe kidneys analyzed. B) The CT image with the digital imaging and communications in medicine format was processed with the Simplify3D® software and the kidneys were printed using a Flashforge Dreamer® 2018 printer. C) This figure shows the 3D printed model of a horseshoe kidney. The model was made of polylactic acid and acrylonitrile butadiene styrene with diameter of 1.75 millimeters; and D) This figure shows the navigation with a digital flexible ureteroscope (3.3 x 670 mm, model DR030670, Endomaster®) in a 3D printed model of a 3D printed ureteral duplication model. (page 888)