I present my Arc Reactor pendant, for use with three 2x12mm tritium vials, which are held in the channels on the pendant's base section (tritium vials not included).
This model has been scaled for printing in stainless steel or plastic.
The attachment hoop is large enough for fine chains, split rings, gate clips and paracord.
This model contains two parts: The larger base section and the front cage section, which covers and protects the vials. Due to potential irregularities in the stainless steel printing process, some filing of the cage section's outer edge may be required, to ensure it will fit into the base section properly.
The tritium vials should be set using a UV activated optically clear adhesive such as Norland 61 or Loctite glass bond. These adhesives will cure in direct sunlight in an hour or so.
I have a few tritium lanterns, available from my Etsy shop (tritium vials not included, due to a recent policy change on teh site). Please contact me if you would like an assembled lantern.
There are some more photos of this object and other examples of my work, both 3D printed and otherwise, on my 'Tofty' facebook page.