Stacking box feeding machine 3D model is available on CGTrader for $85. Original author: forestlsls. Specs: 549376 polys, 556439 verts.
OBJ (OBJ, filesize: 53.9 MB), SLDPRT (SolidWorks, filesize: 13.9 MB), STP (STEP, filesize: 21.7 MB), FBX (Autodesk FBX, filesize: 18.6 MB), 3DS (3D Studio, filesize: 17 MB), IGE (IGES, filesize: 51 MB), MAX (Autodesk 3ds Max, filesize: 172 MB), BIP (KeyShot, filesize: 107 MB)