there is problem with normals in my pc
Native Formats: BLEND (Blender, filesize: 2.16 MB)
Exchange Formats: OBJ (OBJ, filesize: 567 KB), FBX (Autodesk FBX, filesize: 317 KB), STL (Stereolithography, filesize: 414 KB), DXF (DXF, filesize: 395 KB), ABC (Alembic, filesize: 532 KB), DAE (Collada, filesize: 1.36 MB)