# Atari & Firebee Shopping Trolley Key (Multi-Material)

A high-quality, ergonomic shopping trolley chip (23mm diameter) featuring the iconic **Atari** and **Firebee** logos. This project is specifically designed for multi-material 3D printers like the **Flashforge Adventurer 5M Pro (AD5X)** or printers equipped with an AMS/MMU.

## 🚀 Overview

This OpenSCAD project generates a "key-style" trolley chip. Unlike a simple round coin, this design includes a 45mm handle for easy insertion and removal from trolley slots. It supports up to **4 different colors** in a single print.

![a screenshot from OpenScad](side-by-side.png)

### Features
- **Front Side:** Deep-engraved Atari Logo.
- **Back Side:** Deep-engraved Firebee Logo.
- **Handle:** Customized "logo_text.svg" inlay and a 5mm keychain hole.
- **Parametric Design:** Fully adjustable via OpenSCAD.
- **Optimized for AD5X:** Designed to be printed with the first layer facing the bed for a perfectly smooth logo finish.

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## 🛠 Print Settings (Optimized for 0.4mm Nozzle)

To achieve the best results with the fine logo details, use the following settings:

| Parameter | Recommended Value |
| :--- | :--- |
| **Layer Height** | 0.15mm (0.2mm for First Layer) |
| **Wall Loops** | 4 (Important for handle strength) |
| **Top/Bottom Shells** | 5 |
| **Infill** | 30% (Gyroid or Honeycomb) |
| **First Layer Speed** | 15–20 mm/s (Slow is critical for inlays) |
| **Z-Hop** | 0.4mm |
| **Prime Tower** | Enabled (Prevents color bleeding) |

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## 📖 How to Use

### 1. Preparation
Place your SVG files in the same folder as the `.scad` file:
- `logo_atari.svg`
- `logo_firebee.svg`
- `logo_text.svg`

### 2. Exporting STLs
In OpenSCAD, use the `export_mode` variable to render and export the four individual parts:
1. `chip` -> `base.stl` (The main body)
2. `atari` -> `inlay_atari.stl`
3. `firebee` -> `inlay_firebee.stl`
4. `text` -> `inlay_text.stl`

### 3. Slicing (Crucial Step)
1. Import **all 4 STLs** into your slicer at once.
2. When prompted: **"Load as a single object with multiple parts?"**, select **YES**.
3. Ensure the parts are merged/grouped correctly in the object list.
4. **Check the Preview:** Look at Layer 1. Ensure the slicer isn't "over-printing" the logos with the base color. The base should leave exact gaps for the inlays.

### 4. Color Selection
For maximum contrast, we recommend:
- **Base:** Black or Dark Grey
- **Atari Logo:** Red or White
- **Firebee Logo:** Pink or Orange
- **Handle Text:** Light Blue or Lime Green

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## 📸 Screenshot Mode
The code includes a built-in toggle for documentation. Set `show_screenshot_view = true;` in OpenSCAD to see a perfectly centered, side-by-side view of both the front and back of the key.

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## 📜 License
This project is licensed under **Creative Commons - Attribution - Non-Commercial - Share Alike (CC-BY-NC-SA)**.
- **Attribution:** You must give appropriate credit.
- **Non-Commercial:** You may not use the material for commercial purposes.
- **ShareAlike:** If you remix, transform, or build upon the material, you must distribute your contributions under the same license.

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*Created with OpenSCAD - Optimized for the Atari & Firebee community.*