If you're working with 3D models in Maya and need to export them as OBJ files, follow these simple steps to do so. Firstly, ensure that the object you want to export is selected in the Maya viewport. Then, go to File > Export Selection. In the Export Selection window, choose 'Wavefront OBJ' as the File Type. Next, specify the file name and location for the exported OBJ file. You can also adjust the export options such as grouping and object as well as material options. Once you're satisfied with the settings, click 'Export' to save the OBJ file. Congratulations! You've successfully exported your object as an OBJ file in Maya.