Refine STEP/CAD Design for 3D Prototype

Title: Modify Existing STL and CAD Design for Functional 3D Printed Prototype Project Overview I have an existing 3D printed product prototype that is currently functional but has several design issues that need refinement before moving to the next prototype iteration... (Budget: $100 - $300 USD, Jobs: 3D CAD, 3D Modelling, 3D Printing, 3D Rendering, AutoCAD, CAD/CAM, Mechanical Engineering, Solidworks)