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+---
+name: openscad-parametric
+description: Algorithmic solid modeling and precise geometry generation for multi-nozzle toolchanging setups (Bambu Lab H2C).
+disable-model-invocation: false
+category: CAD
+risk: safe
+tags:
+  - openscad
+  - 3d-printing
+  - cad
+  - parametric
+---
+
+# OpenSCAD Parametric Design
+
+## Purpose
+
+To guide the generation of modular, algorithmic, and mathematically precise solid geometry in OpenSCAD, optimized for multi-material toolchanger systems.
+
+## When to Use
+
+Use when writing or editing OpenSCAD (`.scad`) code, calculating tolerances/clearances, structuring modular assemblies, or designing fixtures/parts for Bambu Lab H2C toolchanging architectures.
+
+## Core Design Principles
+
+### 1. Parametric Rigidity
+- Define all key dimensions (lengths, thicknesses, hole diameters, clearances) as variables at the top of the file.
+- Derive dependent geometry using mathematical relations (e.g., `wall_thickness * 2`) rather than hardcoding numbers.
+- Use `$fn` selectively to control cylinder resolution; prefer lower `$fn` (e.g., 16-32) during preview and higher (e.g., 64-128) only for final rendering.
+
+### 2. Multi-Nozzle / Multi-Material Design
+- Organize components into separate modules representing different nozzles/materials.
+- Avoid geometry overlap (which causes slicing artifacts). Use explicit `difference()` operators to cut channels for different materials to lock into each other mechanically.
+- Add clearance margins (typically `0.15mm` to `0.3mm`) between interlocking toolchanged parts depending on the printer's dimensional accuracy.
+
+### 3. Bambu Lab H2C Toolchanger Assemblies
+- Focus on toolchanger mount coordinates, bolt/nut clearances, and alignment pins.
+- Use standardized alignment pins (`4.0mm` diameter pins with `0.2mm` clearance holes) to locate mating parts securely.
+- Ensure overhangs respect the 45-degree rule, or design custom print-in-place breakaway supports.
+
+## Math Utilities Library
+
+Prefer clean mathematical algorithms for curves and shapes:
+```openscad
+// Parametric ellipse helper
+module ellipse(rx, ry, h) {
+    scale([1, ry/rx, 1])
+        cylinder(r=rx, h=h, center=true);
+}
+```