I already have a complete 3D model for my in-car diffuser pod; what I need now is a fresh set of eyes to make the user interface and controls feel effortless. The basic mechanics and enclosure are locked, so your focus is strictly on functional refinement—button placement, tactile feedback, intuitive labeling, and any quick-win ideas that make day-to-day use obvious at a glance. Here’s what I’d like back: • An updated CAD file or annotated render showing revised control layout. • A short explanation (bullet notes are fine) of how each change improves ease of use. • Lightweight suggestions for optional add-ons such as extra control modes or a small display, if you see room for them, but the primary goal is simplicity. I’ll share the original STEP/IGES files as soon as we start. Keep the changes practical so they can move straight into a prototype run without major tooling edits.