Mobile robot 3D model is available on CGTrader for $5. Original author: jaketnet2012.
MAT (mat, filesize: 36.4 MB), PNG (PNG, filesize: 36.4 MB), JPG (JPG, filesize: 36.4 MB), MAX (Autodesk 3ds Max, filesize: 36.4 MB), SLDPRT (SolidWorks, filesize: 36.4 MB), IGE (IGES, filesize: 36.4 MB), FBX (Autodesk FBX, filesize: 36.4 MB)