Smart NFC/RFID Keychain – Hidden Tag Inside

🔑 Custom NFC / RFID Keychain – Hidden Tag Inside

Turn any keychain into a smart NFC / RFID device 🔥
Fully customizable, fully parametric — and printed in one single piece.

No glue required for assembly. No visible seams. Just clean results.

⚡ HOW IT WORKS

This model uses a mid-print pause technique:

• The printer builds the keychain normally
• It pauses exactly when the internal cavity is ready
• You insert the NFC/RFID tag
• Printing resumes and seals it inside permanently

➡️ Final result: a solid keychain with a completely hidden smart tag inside

✨ FEATURES

• Multiple shapes (rectangle, circle, oval, rounded)
• Built-in hidden NFC/RFID slot
• Supports round and rectangular tags
• Adjustable tolerances for perfect fit
• Add custom text (multi-line)
• Upload your logo (SVG) directly in MakerWorld
• Multi-color ready (perfect for AMS)
• Optimized for FDM & resin printing

🧠 NFC / RFID COMPATIBILITY

Works great with:

• NTAG213 / NTAG215 / NTAG216
• Mifare Classic
• Round NFC tags (25–30 mm)
• Thin NFC stickers

⏸️ HOW TO PAUSE PRINT (BAMBU STUDIO)

1. Find the pause height

Open the model in OpenSCAD and check the console output.

Example:

Pause Z = 3.5 mm

2. In Bambu Studio

1. Import the model
2. Switch to Preview mode
3. Use the layer slider on the right
4. Find the layer closest to the pause height

👉 IMPORTANT:
Always select the layer just BELOW the value
Example:
3.5 mm → use 3.4 mm (NOT 3.6 mm)

3. Add the pause

• Click the "+" icon on that layer
• Select "Pause at this layer"

4. During printing

When the printer pauses:

1. Clean the cavity (remove any strings or blobs)
2. Insert the NFC/RFID tag flat into the slot
3. Make sure it fits properly and sits flush

💡 Optional (recommended):
Add a small drop of glue to keep the tag in place before resuming.
This helps prevent movement while the top layers are printed.

1. Resume printing

The final layers will seal the tag inside permanently

⚠️ TIPS

• Tag too tight → increase tolerance (+0.1 mm)
• Tag loose → decrease tolerance
• Slow down top layers after pause for better finish
• Always test fit before final print

🖨️ PRINT SETTINGS

• Layer height: 0.2 mm
• Walls: 3+
• Infill: 30–50%
• Material: PETG recommended (more durable than PLA)

🎯 PERFECT FOR

• Smart keychains
• NFC business cards
• Home automation tags
• Gifts & branding
• Everyday carry

🚀 WHY THIS MODEL

✔ One-piece print
✔ Hidden NFC integration
✔ Clean professional result
✔ Fully customizable
✔ MakerWorld Customizer ready