# SphereFlow V4 — Orbital MVP

V4 translates the selected Option 2 concept into supplier-discussion CAD. It
keeps the recognizable orbital ring, compact spherical water chamber and classic
pipe silhouette while making the exterior a replaceable two-part print.

## Architecture

- Borosilicate glass bowl, downstem, water chamber and mouth airway
- High dry-side outlet with an uphill return slope toward the chamber
- Borosilicate splash shelf above the nominal 17.6 mL waterline
- Two PA12 shell halves, split on the centre plane
- Small TPU or silicone cosmetic/cushion inserts outside the airflow
- Bowl port doubles as the fill and drain opening

## Measured CAD values

- Overall envelope: 172.7 × 61.8 × 79.4 mm
- Nominal water: 17.6 mL
- Combined printed-shell solid volume: 40.2 cm³
- Approximate PA12 shell mass at 1.01 g/cm³: 40.6 g

## Main files

- `exports_v4/sphereflow-v4-orbital.step` — complete editable assembly
- `exports_v4/shell_front.stl` — printable shell half
- `exports_v4/shell_back.stl` — printable shell half
- `exports_v4/borosilicate_core.step` — glass supplier reference
- `exports_v4/glass_bowl_downstem.step` — bowl/downstem reference
- `exports_v4/glass_splash_guard.step` — anti-splash supplier reference
- `exports_v4/sphereflow-v4-assembly.glb` — phone/web exterior model
- `exports_v4/sphereflow-v4-cutaway.glb` — phone/web cutaway model

## Prototype status

This is concept-grade CAD for visualization, fit samples and supplier DFM. The
glass joint taper, real shell retention bosses, dimensional tolerances, thermal
clearance, pressure drop, cleanability, tip stability and splash resistance must
be tested on physical prototypes. It is not a certified consumer product.
