This tutorial is suitable for designers who have a basic knowledge of using the open source product Autodesk 123D Design. The steps to build a Breitenberg vehicle are as follows: 1. Modeling a wheel: a cylinder with a diameter of 2 cm and a height of 0.5 cm is placed in the workspace. Drill a hole in it by drawing a circle with a diameter of 0.3 cm and extruding - 0.5 cm with the Extrude tool. We soften the edges of the cylinder with Fillet Radius: 0.5. 2. Clone the wheel: rotate the resulting wheel 90° along the Z axis and copy it with Ctrl+C and Ctrl+V. 3. Modeling the vehicle body: regarding the design of the vehicle body, there are various options. In this case the author models a classic vehicle, which is most often shown in the bibliographic sources. After drawing and extruding a surface with the desired shape we apply Fillet with radius 35 on the back edge and with 30 on the front edge for a contemporary design (i could provide more images if it is needed). On the selected side edges we successively apply Fillet with a radius of 9. 4. Make a special place for the sensor: it is necessary to select the square plane that is located in the middle of the case and successively apply Sketch > Project, Sketch > Offset and Construct > Extrude with a negative value.