Shopping Cart Token Keychain with QR

🛒

This keychain incorporates a detachable token (similar to a €0.50 coin) compatible with most shopping carts in Germany and other EU countries. The housing integrates a QR code that, in this version, links to my MakerWorld page.
🔧 Optionally, replace this QR code with your own using a QR code generator like https://goqr.me (for example, linking to a website, social media, or messenger), and modify the logo to your company's logo or personal emblem.

💡 The original Fusion 360 (.f3d) file is also included—allowing for customized model modifications.

The token is securely held within the keychain yet easily removable when needed.

🔧 Features:

• Suitable for printing on standard FDM printers
• Optimized for PLA/PETG
• The QR code is clear and easily scanned with a smartphone
• Conveniently carried on a key ring
• Can be used as a corporate souvenir

🔓 License and Terms of Use:

• ✅ Non-commercial use permitted
• ✅ Remixing/modifications permitted
• 🚫 Commercial use of both the original and remixes is prohibited
• 🏷 When publishing remixes, please credit me as the author

📦 Don't have a 3D printer?

Order a printed keychain directly from me (delivery within Germany). Personalization with your logo and QR code is also available.

🎨 Multicolor Printing and STL Structure:

• The QR code and the keychain body are separate bodies within a single STL file. This facilitates convenient multi-color painting in your slicer.
• All inscriptions on the token, as well as the shopping cart image, are also separate bodies integrated into the overall file.
• For correct color display:
  🔹 In the slicer, click the “Split into parts” button
  🔹 Each element can then be colored individually, but they will remain in their original positions (in the body tab displaying the list of bodies).

Recommendations for High-Quality QR Code Printing (Important!)

For crisp, durable, and easily scannable QR code printing, adhere to these proven settings:

✅ 1. Print the QR code after the token base

Printing the QR code first often leads to small elements failing to adhere properly and being scraped off by the nozzle.

🔧 Configuration:

• In OrcaSlicer/Bambu Studio, click
  “Configure current print plate”
  (⚠️This button is located near the print plate visualization, not in the left-hand menu!)

• 

• 

  In the dialog box, ensure that the token base is printed first, followed by the QR code (using a different filament).

✅ 2. Print infill before walls

• Enable the option: “Print infill before walls”
  This creates an even base for the QR code, improving adhesion.

✅ 3. Correct perimeter printing order

• Set the order to:
  External → Internal
  This ensures crisp QR code edges and prevents excess plastic buildup inside the elements.

✅ 4. First layer settings:

• Layer height: 0.3 mm
• Print speed: 10 mm/s
• Flow rate: 0.85 (Bambu Studio lacks first-layer flow rate adjustment; use OrcaSlicer or Anycubic Slicer Next if needed; subsequent layers use standard flow rate)

✅ 5. First layer temperature:

📌 PLA:

• Hotend: 190–195°C
• Bed: 50–55°C

📌 PET-G:

• Hotend: 205°C
• Bed: 75°C (or the minimum stable temperature for your material)

⚠️ The bed should not be too hot! Otherwise, the plastic will spread, flooding the fine details of the QR code.

✅ 6. Subsequent layers:

• Layer height: 0.2 mm
• PLA temperature: 200–210°C
• PET-G temperature: 235–245°C

These parameters ensure consistently printed, well-adhered, and flawlessly scannable QR codes.