I present my small Anchor shaped charm, designed to take one 2x12mm and two 2x6mm tritium vials (tritium vials not included).
This model is sized for printing in all available materials.
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.
There are some more photos of this object and other examples of my work, both 3D printed and otherwise, on my 'Tofty' facebook page.