Four legs robot 3D model is available on CGTrader for $8. Original author: jishnukamalbora70. Specs: 135571 polys, 67931 verts.
STL (Stereolithography, filesize: 6.46 MB), OBJ (OBJ, filesize: 20 MB), FBX (Autodesk FBX, filesize: 3.74 MB), MA (Autodesk Maya, filesize: 21.4 MB), BLEND (Blender, filesize: 3.69 MB), DAE (Collada, filesize: 16.9 MB)