Convert STL Mechanical Part to STEP

I have a mechanical part currently saved as an STL file and I need it converted to a clean, editable STEP model that will hold up perfectly when I send it out for 3D printing. Please keep every feature... (Budget: $30 - $250 NZD, Jobs: 3D CAD, 3D Design, 3D File Scaling, Slicing & Print Preparation, 3D Modelling, 3D Printing, AutoCAD, CAD/CAM, Solidworks)