Fusion Revamp & PETG Prototype Prints

I have a simple Tinkercad model of three coaxial tubes—same inner diameter, varying outer diameters, arranged end-to-end—that represents an obsolete component I intend to replace through lost-foam casting... (Budget: $30 - $250 USD, Jobs: 3D CAD, 3D Design, 3D File Scaling, Slicing & Print Preparation, 3D Modelling, 3D Printing, 3D Rendering, CAD/CAM, Fusion 360, Prototyping, PrusaSlicer)