View on GitHub

Hammes Hacks

Projects designed by Emily Hammes

Coin Cell Necklace Clasp





  1. Print both sides of the clasp.
  2. Cut the wire into 2 equal length pieces.
  3. Strip both ends of the wire.
  4. Thread the wires through the 3D printed parts.
  5. Make a loop out of the wire inside the 3D printed part and place a blob of solder on it. This will keep the wire in the plastic and act as a contact for the battery.
  6. Solder the other ends of the wires to the positive and negative sides of the electric pendant.
  7. Use a black and/or red permanent marker and mark the blob of solder inside the coin holder with the positive and/or negative sides of the pendant. This will make it much easier to figure out which way the battery goes later.
  8. Put the battery in with the + side on the red/positive wire and the - side on the black/ground side of the wire.