To export projects into .stl and .obj formats, you will need to download the 3D Builder app, export the file as .3mf first, and then to the .stl or .obj format.

You can try out the package on this file (more files will be added soon) You will have to give to inputs, The file you want to convert. (ex - E:\cctech\assignment 1 stl_obj_convertor\data\cube.stl) ...