3D Model Tweaks for Printing

I already have a single 3D file that almost meets my needs, but before I send it to the printer I want to tighten up a few things. • Resizing: Only the bottom part needs to change—dimensions must stay proportional to the rest of the piece so everything still fits together cleanly... (Budget: $30 - $250 USD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Modelling, 3D Print Design, 3D Printing, 3D Rendering, 3ds Max)