High-Finish Prototype 3D Print

I have a completed STL/STEP file and need it printed exactly to scale for a display model. Visual quality is key: the surface must be smooth enough that a quick pass with fine sandpaper lets me move straight to paint... (Budget: ₹600 - ₹1250 INR, Jobs: 3D CAD, 3D Model Maker, 3D Modelling, 3D Post Processing, 3D Print Design, 3D Rendering, CAD/CAM, Solidworks)