Geometrically functional working spur gear. The center of gear can easily be selected via the outside diameter, on the IGES and DXF file formats only. The gear interior is solid so you can insert a custom shaft bore. The model is a 3D solid in IGES and DXF format. It is a polygonal mesh in OBJ and STL formats. It can be 3D printed by downloading STL format. The IGES and DXF formats can be modified and exported as STL files for customized 3D printing, for all kinds of projects where gears are required. Please enjoy the file and I appreciate suggestions. My goal is to make you happy and upload the right working models online for a very reasonable price.