Freelancer:
UshaIslam
Người chiến thắng
Rocket
Not sure whether it is OK or not. The given STL file is too complicated and probably made by scanning where two individual STL files merged. In building the model, I tried to be as close as possible to keep the outer side as given in the given STL file. I used Solidworks to build the model. If you like it, please tell me in what 3D CAD format you want for 3D printing.