Finalize Production Ready Pendant STL

I will send you the current STL together with a clear reference photo. The model in its present state is riddled with non-manifold edges, internal defects and other mesh problems, so it cannot go straight to the caster... (Budget: €8 - €30 EUR, Jobs: 3D CAD, 3D Design, 3D File Scaling, Slicing & Print Preparation, 3D Modelling, 3D Printing, 3D Rendering, 3ds Max, Solidworks)