Refine STL For Printing

I already have the model as a single STL, but it still needs a little love before it can go to the printer. Please clean up the mesh—remove any non-manifolds, holes, loose shells, and other common issues—then scale the piece to the exact millimeter dimensions I will provide once we start... (Budget: $15 - $25 AUD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Modelling, 3D Printing, 3D Rendering, Blender, Rhino 3D)