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In this video I walk through the process of making rings out of clear polyester resin, a type of moldable plastic. I show you everything from mold-making to embedments. I used this same technique to make my RFID rings, which are clear plastic containing unique microchips useful for electronics projects where you want to identify a specific person wearing one. Thanks to Townsend Atelier for the sample of Knead-a-Mold, a welcomed (and much easier to work with) alternative to pourable silicone for mold-making.

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Materials:

  • clear casting resin and hardener – Michael’s or other craft store
  • plastic cups
  • wooden or plastic mixing sticks
  • silicone mold-making material – Townsend Atelier Knead-a-Mold or Polytek TinSil
  • measuring cup (if using Knead-a-Mold) or high accuracy scale (if using TinSil)
  • original from which to make a mold, mine was 3D printed
  • turpentine for cleaning up unhardened resin mess
  • nitrile or latex gloves
  • dremel (small rotary tool) or sandpaper for touchups

Safety precautions:

  • Pourable silicone and craft resins emit fumes that are bad for you. Work outside or in a very well ventilated area or use a respirator, which is not the same thing as a dust mask. If you’re pregnant, wait until you are no longer so before attempting this project.
  • Craft resin is bad for your skin; wear gloves even if you don’t think you’ll spill.
  • Keep your kids and pets away from your work table.
  • Read and understand all info in the MSDS sheet that comes with these materials

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Becky Stern

Becky Stern is director of wearable electronics at Adafruit Industries. Her personal site: sternlab.org


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