Check out I made a butterfly knife from a cs go game I made a skin myself Low-poly 3D model on CGTrader for $6. High-quality Polygon mesh mesh by artcir311: 298557 polys, 150785 vertices.
BLEND (Blender, filesize: 1.45 MB), OBJ (OBJ, filesize: 21.7 MB), FBX (Autodesk FBX, filesize: 5.63 MB), GLTF (glTF, filesize: 526 KB), DAE (Collada, filesize: 688 KB), STL (Stereolithography, filesize: 14.2 MB), ABC (Alembic, filesize: 1.61 MB)