"May the 4th" - NFC Challenge Coin

This isn’t just a coin—it’s a smart coin.

A fully 3D printable challenge coin with a hidden NFC chip, designed with a pause-in-print feature so the chip is sealed inside the model.

What makes this one different:

• Embedded NFC (hidden inside the print)
• Pause at layer → drop in chip → resume print
• Fully sealed coin (no glue, no snap needed)
• Clean two-tone design (perfect for AMS or manual swap)

How it works (super simple):

1. Start the print
2. Printer pauses automatically at the chip layer
3. Drop in your NFC chip (NTAG213/215/216)
4. Hit resume
5. Printer seals it inside forever

What you can do with it:

• Tap → open your website
• Share contact info instantly
• WiFi auto-connect coin
• Smart home trigger
• Event badge / digital business card
• Or… cause chaos with a perfectly timed prank

Recommended Print Settings:

• Layer Height: 0.16–0.2
• Walls: 3–4
• Infill: 15–20%
• Material: PLA (easy) / PETG (durable)

Important Tips:

• Program your NFC chip BEFORE inserting
• Place chip flat and centered when paused
• Don’t move the bed while paused (keep alignment perfect)
• If your slicer doesn’t auto-pause:
  • Add a pause at height manually in your slicer

Why this design is cool:

Most NFC prints use glue or slots…
This one literally prints the tech inside the object.

It feels like a normal coin—but it secretly does something.

If you print one, drop a make
Curious to see what people program these to do.

May the 4th be with your prints.