'○' Collars
This is a demo page for BellJar collars (the ring section).
Why collars matter (demo)
- Adds vertical space without changing the base
- Creates side-wall port area
- Lets you scale volume step-by-step
Options (demo)
| Collar | Purpose | Notes |
|---|---|---|
| Short | compact build | minimal volume |
| Medium | most common | good port density |
| Tall | max volume | consider stiffness / handling |