The 3D modeling of the robot can be done in any 3D CAD software. You can use popular commercial software such as AutoCAD, SOLIDWORKS, and CATIA or free software such as Blender. The design can be customized according to your specification. Here, you can see a 3D model of the robot built using Blender. Using the 3D model, we can perfect the robot's design without building the actual hardware. We can also create the 3D simulation of the robot using this model. The following screenshot shows the 3D model of a robot designed using Blender:
Figure 7: The 3D model
You can check out this model at chapter_9_codes/chefbot.