$29 Kuka Robotics KR 16-3 Arm 3D model by Polygate. Available on CGTrader with 119963 polys and 123832 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 93.7 MB), 3DS (3D Studio, filesize: 44.5 MB), C4D (Cinema 4D, filesize: 45.9 MB), LWO (Lightwave, filesize: 46.7 MB), FBX (Autodesk FBX, filesize: 48.7 MB), MA (Autodesk Maya, filesize: 47.5 MB), MAX (Autodesk 3ds Max, filesize: 119 MB)