Build your own light-up TARDIS pendant using a simple LED circuit and 3D printing. Grab your companion and let’s put it together!

For this project you will need:

• 3D printer or access to mail order/community share 3D printing services
• coin cell battery breakout board in 12mm or 20mm size
• CR2032 or CR1220 battery
• white LED sequins or other small LEDs
• slide switch
• soldering supplies
• silicone coated wire
• split ring and necklace