If you like making jewelry and have some experience using the Othermill, this is a great project for you! It offers a wonderful way to get creative and artistic with double-sided machining on the Othermill.

The necklace has four LEDs on the back of the pendant that provide a beautiful glow around the outline of the pendant and highlight the pattern on the front of the necklace by illuminating the etched traces. This tutorial gives you two design options: a blank, solid copper front or a bird feather pattern on the front.

We also made a bat version of this necklace! Everything is the same, except the shape of the board, so the instructions here apply to the bat as well as the hummingbird. Both files are downloadable in the next step.

Feel free to use this technique to design your own pendants by mixing and matching your favorite shapes with your favorite colored LEDs. If you do design your own unique necklace, please post pictures of your creation in the comments. All of us here at Other Machine Co. would love to see them!

Note: This is the V2 of our PCB Hummingbird Necklace.

Step 1: Tools, Materials, and Files


  • Othermill
  • Computer with Otherplan installed
  • Flat end mill, 1/64" and 1/32"
  • Hotplate, heat gun, or convection oven or very steady hands with fine-tipped soldering iron
  • Jewelry tweezers or other precision tweezers
  • Needlenose pliers (2)
  • Wire cutters unless your needlenose pliers can cut
  • Multimeter in case troubleshooting is needed


  • FR-1 board, single and/or double sided
  • LEDs, surface-mount (4)
  • Jewelry-making supplies:
    • Jump rings (4)
    • Clasp
    • Chain cut to desired length with wire cutters
  • Battery, CR1025, 3-volt
  • Battery holder, surface-mount,for the CR1025
  • Switch, surface-mount, tiny
  • Double-sided tape
  • Solder paste

Note: All the materials listed above, with the exception of the tap and paste, are included in our handy Light-Up Necklace Kit.


  • Hummingbird Necklace.brd
  • OR Bat Necklace.brd
<p>Nice! I love LEDs but have used mostly the more powerful ones (5W+) for my builds... Mostly flashlights and sort...</p><p>But the decent glow just is enough to carve out the silhouette of the bracelet. Love it!</p>
<p>Ooh, a 5W LED right there would be quite bright :)</p>
Hahaha! Indeed! Ironsman's ARC-Reactor would be a dim flicker compared to it. :)<br>
<p>What about adding something like a fabric coating on the back of the battery holder? This would prevent any annoying stinging by the metal :) Apart from that, good job :)</p>
<p>That's a good idea.</p>
<p>to cool</p>
<p>The Othermill is awesome! Kudos on your success. I saw on at Maker Faire NYC in 2013 and was blown away. (I was too busy at Maker Faire NYC 2014 to actually see anything...) Keep up the cool projects!</p>
<p>Thank you!</p>
Very Nicely Detailed and Beautiful !
<p>A very nice detail! </p>
<p>wow. very nice... </p>
excelente detalle!!
very nice..look cute

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