Parametric Knob / Bouton Paramétrique

Fully parametric OpenSCAD knob designed for resin or FDM 3D printing.

Features:
- 40 mm outer diameter
- Diamond knurling with adjustable angle and rotation
- Blind D-shaft mount (6 mm D shaft)
- Reinforced internal ribs
- Extended center column for deep shaft engagement
- Elegant recessed position indicator on top face
- Configurable dimensions and knurling parameters
- Optimized for OpenSCAD 2021 performance and STL export

The design is intended for premium rotary controls, audio equipment, synths, industrial interfaces, and custom electronics projects.

All major dimensions and aesthetic parameters can be adjusted directly in the OpenSCAD source.