ABB IRB 6650S 3D model is available on CGTrader for $59. Original author: Polygate. Specs: 114750 polys, 118493 verts.
OBJ (OBJ, filesize: 2.41 MB), MAX (Autodesk 3ds Max, filesize: 33 MB), C4D (Cinema 4D, filesize: 1.52 MB), 3DS (3D Studio, filesize: 789 KB), MA (Autodesk Maya, filesize: 3.04 MB), MEL (Maya Mel Script, filesize: 3.04 MB), FBX (Autodesk FBX, filesize: 4.56 MB)