homeracker

# 🦶 Foot Insert

## 📌 What

A standalone foot insert that plugs into any HomeRacker connector arm from the outside. Replaces the former built-in `is_foot` connector option with a separate, modular component.

## 🤔 Why

- **Flexibility**: Feet are now independent — add or remove them without needing special connector variants. When extending a rack vertically, just unmount the feet and add levels to the bottom.
- **Simplicity**: Removes `is_foot` complexity from the connector module (fewer variants to maintain and export).
- **Material choice**: Can be printed in **TPU** for better grip and load distribution, while the connector stays rigid (PLA/PETG).

## 🔧 How

Open `parts/foot.scad` in OpenSCAD and use the **Customizer** panel.

| Parameter | Default | Description |
|-----------|---------|-------------|
| `debug_colors` | `false` | Show distinct colors per section for visualization |
| `disable_chamfer` | `false` | Remove chamfers from all sections |
| `anchor` | `CENTER` | BOSL2 anchor point for positioning |
| `spin` | `0` | BOSL2 spin rotation (degrees) |
| `orient` | `UP` | BOSL2 orientation vector |

### Geometry

Three stacked parts (top → bottom, using BOSL2 `attach()`):

1. **Support section** (15×15×15mm): A 1-unit `support()` with `x_holes=true`, oriented downward. Plugs into the connector arm with lock pin holes in both perpendicular directions.
2. **Spacer** (15×15×1.1mm): Inset shim at the arm entry — `TOLERANCE/2` shift-out plus `BASE_CHAMFER` inset for a flush transition. Chamfered on side edges.
3. **Base plate** (19.2×19.2×2mm): Wider platform for load distribution and grip. Chamfered on all edges except the top face.

### Usage

```scad
include <foot/lib/foot.scad>

// Default foot
foot();

// Debug visualization
foot(debug_colors=true);

// Flat base (no chamfer)
foot(disable_chamfer=true);
```

## 📸 Catalog

| Part | Preview |
|------|---------|
| Foot | ![Foot](parts/renders/foot.png) |

To generate or refresh previews:

```sh
./cmd/export/export-png.sh models/foot/parts/foot.scad
```

## 📚 References

- [HomeRacker core](../core/README.md) — connectors, supports, lock pins
- [Connector module](../core/lib/connector.scad) — the connector arms where feet insert