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+# 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.
+
+### 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.
+
+---
+
+## 🛠 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) |
+
+---
+
+## 📖 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
+
+---
+
+## 📸 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.
+
+---
+
+## 📜 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.
+
+---
+*Created with OpenSCAD - Optimized for the Atari & Firebee community.*
--- a/chip.scad
+++ b/chip.scad
@@ -0,0 +1,77 @@
+// Version 2.2.0
+// Changelog:
+// 1.9.0: Fix für Mesh-Fehler und Zentrierungs-Offset (Y+2 bei Atari)
+// 2.1.0: Multi-Material-Modus für AD5X
+// 2.2.0: Optimierung der Logo-Tiefe auf 0.6mm und Finalisierung
+
+$fn = 100;
+
+// --- EXPORT-STEUERUNG ---
+// Ändere diesen Wert für den jeweiligen STL-Export:
+// "vorschau" -> Zeigt alles farbig an
+// "chip"     -> Basis mit Aussparungen (Exportieren als chip.stl)
+// "atari"    -> Nur die Füllung oben (Exportieren als atari.stl)
+// "firebee"  -> Nur die Füllung unten (Exportieren als firebee.stl)
+modus = "vorschau"; 
+
+// --- Parameter ---
+chip_radius = 11.625; 
+chip_hoehe = 2.4;
+logo_tiefe = 0.6; 
+max_logo_mass = (chip_radius * 2) * 0.75; 
+
+// --- Logo Module (2D Definitionen) ---
+
+module logo_atari() {
+    render() 
+    translate([0, 2, 0]) // Dein manueller Y-Offset
+    resize([max_logo_mass, max_logo_mass, 0], auto=true) {
+        offset(delta = 0.01)
+            import("atari_logo.svg", center = true);
+    }
+}
+
+module logo_firebee() {
+    render()
+    mirror([1, 0, 0])
+    resize([max_logo_mass, max_logo_mass, 0], auto=true) {
+        offset(delta = 0.01)
+            import("firebee.svg", center = true);
+    }
+}
+
+// --- Konstruktion ---
+
+// 1. Der Chip-Körper (Die Form mit den "Löchern")
+if (modus == "vorschau" || modus == "chip") {
+    difference() {
+        color("Grey")
+            cylinder(h = chip_hoehe, r = chip_radius, center = true);
+        
+        // Aussparung für Atari oben
+        translate([0, 0, chip_hoehe/2 - logo_tiefe + 0.01])
+            linear_extrude(height = logo_tiefe + 0.1, convexity = 10)
+                logo_atari();
+                
+        // Aussparung für Firebee unten
+        translate([0, 0, -chip_hoehe/2 - 0.1])
+            linear_extrude(height = logo_tiefe + 0.1, convexity = 10)
+                logo_firebee();
+    }
+}
+
+// 2. Das Atari-Inlay (Die Füllung für oben)
+if (modus == "vorschau" || modus == "atari") {
+    color("Cyan")
+    translate([0, 0, chip_hoehe/2 - logo_tiefe])
+        linear_extrude(height = logo_tiefe, convexity = 10)
+            logo_atari();
+}
+
+// 3. Das Firebee-Inlay (Die Füllung für unten)
+if (modus == "vorschau" || modus == "firebee") {
+    color("Orange")
+    translate([0, 0, -chip_hoehe/2])
+        linear_extrude(height = logo_tiefe, convexity = 10)
+            logo_firebee();
+}
--- a/chip_handle.scad
+++ b/chip_handle.scad
@@ -0,0 +1,180 @@
+/*
+================================================================================
+ATARI & FIREBEE SHOPPING TROLLEY KEY (Multi-Material Edition)
+Version: 3.2.0
+License: Creative Commons - Attribution - Non-Commercial - Share Alike (CC-BY-NC-SA)
+================================================================================
+
+USER MANUAL:
+1. Ensure the following SVG files are in the same folder as this .scad file:
+   - logo_atari.svg (Front side of the round chip)
+   - logo_firebee.svg    (Back side of the round chip)
+   - logo_text.svg  (Back side on the handle/grip)
+2. Use the 'export_mode' variable below to switch between parts for export.
+
+3. For a multi-color print on the AD5X:
+   - Set export_mode = "chip"; -> Render (F6) -> Export STL as 'base.stl'
+   - Set export_mode = "atari"; -> Render (F6) -> Export STL as 'inlay_atari.stl'
+   - Set export_mode = "firebee"; -> Render (F6) -> Export STL as 'inlay_firebee.stl'
+   - Set export_mode = "text"; -> Render (F6) -> Export STL as 'inlay_text.stl'
+
+4. Import all 4 STLs into your slicer (e.g., OrcaSlicer) simultaneously.
+
+5. When asked "Load as a single object with multiple parts?", select YES.
+
+6. Assign your 4 filaments to the respective parts.
+
+OPTIMAL PRINT SETTINGS (0.4mm Nozzle):
+- Layer Height: 0.15mm (0.2mm for first layer)
+- Wall Loops: 4 (Crucial for mechanical strength of the chip and keyhole)
+- Top/Bottom Shells: 5
+- Infill: 30% (Gyroid or Honeycomb recommended)
+- First Layer Speed: 15-20 mm/s (Slow is vital for the fine inlays on the bed)
+- Cooling: 100% after layer 2
+- Prime Tower: Enabled (To prevent color bleeding between the 4 colors)
+- Z-Hop: 0.4mm (Prevents the nozzle from scarring finished color areas)
+================================================================================
+*/
+
+// --- GLOBAL SETTINGS ---
+$fn = 100; // Detail level for circular geometries
+
+// --- EXPORT CONTROL ---
+// "preview" -> Visualizes all colors together
+// "chip"    -> The main body with all hollowed-out pockets
+// "atari"   -> The inlay for the front Atari logo
+// "firebee" -> The inlay for the back Firebee logo
+// "text"    -> The inlay for the text on the handle
+export_mode = "preview"; 
+
+// --- DIMENSIONS & PARAMETERS ---
+chip_radius = 11.5;    // Standard 23mm diameter
+chip_height = 2.4;      // Total thickness
+logo_depth = 0.6;      // Depth of the engravings (approx. 4 layers at 0.15mm)
+max_logo_size = (chip_radius * 2) * 0.70; // Scaling factor for round logos
+
+// Handle (Grip) Parameters
+handle_length = 45;     // Length from the bottom edge of the chip to the end
+handle_width = 16;      // Width of the rectangular grip
+handle_corner_radius = 3; 
+taper_start_y = -7.5;   // Y-coordinate where the chip begins to taper into the handle
+hole_diameter = 5;      
+hole_offset_bottom = 7; // Hole center distance from the bottom edge
+
+// Margin & Spacing for handle text
+handle_margin = 2;      
+hole_clearance = 2;     // Space between the hole and the text
+taper_clearance = 2;    // Space before the handle tapers into the chip
+
+// --- FILENAMES ---
+file_atari = "logo_atari.svg";
+file_firebee = "logo_firebee.svg";
+file_text = "logo_text.svg"; 
+
+// --- CALCULATIONS FOR TEXT PLACEMENT ---
+hole_top_edge_y = (-chip_radius - handle_length + hole_offset_bottom) + (hole_diameter/2);
+text_limit_bottom = hole_top_edge_y + hole_clearance;
+text_limit_top = taper_start_y - taper_clearance;
+available_text_length = abs(text_limit_top - text_limit_bottom);
+text_y_position = text_limit_bottom + (available_text_length / 2);
+
+
+// --- LOGO MODULES (2D DEFINITIONS) ---
+
+module module_logo_atari() {
+    render() 
+    translate([0, 2, 0]) // Manual alignment for specific SVG geometry
+    resize([max_logo_size, max_logo_size, 0], auto=true)
+        offset(delta = 0.01) // Closes paths to prevent mesh errors
+            import(file_atari, center = true);
+}
+
+module module_logo_firebee() {
+    render() 
+    // Mirroring on the Y-axis (vertical) so it "flies up" on the back side
+    // mirror([0, 1, 0])
+    resize([max_logo_size, max_logo_size, 0], auto=true)
+        offset(delta = 0.01)
+            import(file_firebee, center = true);
+}
+
+module module_logo_text() {
+    render()
+    mirror([1, 0, 0]) // Mirror for correct legibility on the bottom side
+    rotate([0, 0, 90]) // Rotate to align with handle axis
+    // Resize to fit perfectly within calculated handle area
+    resize([available_text_length, handle_width - (2 * handle_margin), 0], auto=true)
+        offset(delta = 0.01)
+            import(file_text, center = true);
+}
+
+// --- GEOMETRY MODULES ---
+
+module module_handle_shape() {
+    difference() {
+        hull() {
+            // Chord calculation: circle width at taper start point
+            chord_length = 2 * sqrt(pow(chip_radius, 2) - pow(taper_start_y, 2));
+            translate([-chord_length/2, taper_start_y - 0.1, -chip_height/2])
+                cube([chord_length, 0.1, chip_height]);
+
+            // Rounded end of the handle
+            end_y_pos = -chip_radius - handle_length + handle_corner_radius;
+            translate([-(handle_width/2 - handle_corner_radius), end_y_pos, 0])
+                cylinder(h = chip_height, r = handle_corner_radius, center = true);
+            translate([(handle_width/2 - handle_corner_radius), end_y_pos, 0])
+                cylinder(h = chip_height, r = handle_corner_radius, center = true);
+        }
+        // Keyhole subtraction
+        translate([0, -chip_radius - handle_length + hole_offset_bottom, 0])
+            cylinder(h = chip_height + 2, r = hole_diameter/2, center = true);
+    }
+}
+
+
+// --- FINAL ASSEMBLY ---
+
+// 1. MAIN KEY BODY (Chip and handle with engraved pockets)
+if (export_mode == "preview" || export_mode == "chip") {
+    difference() {
+        union() {
+            color("Grey") cylinder(h = chip_height, r = chip_radius, center = true);
+            color("Grey") module_handle_shape();
+        }
+        // Pocket for Atari (Top)
+        translate([0, 0, chip_height/2 - logo_depth + 0.01])
+            linear_extrude(height = logo_depth + 0.1, convexity = 10)
+                module_logo_atari();
+                
+        // Pocket for Firebee (Bottom)
+        translate([0, 0, -chip_height/2 - 0.1])
+            linear_extrude(height = logo_depth + 0.1, convexity = 10)
+                module_logo_firebee();
+        
+        // Pocket for Text (Bottom)
+        translate([0, text_y_position, -chip_height/2 - 0.1])
+            linear_extrude(height = logo_depth + 0.1, convexity = 10)
+                module_logo_text();
+    }
+}
+
+// 2. ATARI INLAY (Top Color)
+if (export_mode == "preview" || export_mode == "atari") {
+    color("Cyan") translate([0, 0, chip_height/2 - logo_depth])
+        linear_extrude(height = logo_depth, convexity = 10)
+            module_logo_atari();
+}
+
+// 3. FIREBEE INLAY (Bottom Color A)
+if (export_mode == "preview" || export_mode == "firebee") {
+    color("Orange") translate([0, 0, -chip_height/2])
+        linear_extrude(height = logo_depth, convexity = 10)
+            module_logo_firebee();
+}
+
+// 4. HANDLE TEXT INLAY (Bottom Color B)
+if (export_mode == "preview" || export_mode == "text") {
+    color("Lime") translate([0, text_y_position, -chip_height/2])
+        linear_extrude(height = logo_depth, convexity = 10)
+            module_logo_text();
+}
--- a/logo_atari.svg
+++ b/logo_atari.svg
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--- a/side-by-side.png
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