Check out running machine 3D model on CGTrader for $5. High-quality mesh by nao5970.
OBJ (OBJ, filesize: 6.44 MB), MAX (Autodesk 3ds Max, filesize: 7.43 MB), 3DM (Rhinoceros 3D, filesize: 4.52 MB), BIP (KeyShot, filesize: 1.76 MB), STP (STEP, filesize: 1.45 MB)