I present my Hex X1 tritium lantern, for use with a single 3x22.5mm tritium vials (vials not included).
This model has been scaled for printing in stainless steel, but can be printed in most materials.
The attachment hole is large enough for small to medium split ring.
The tritium vial 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.
Before gluing, please ensure that all the vial fits loosely into the lantern body and that there are no tight spots. Due to potential irregularities in the printing process, some gentle drilling may be required on the tritium vial channel, to ensure an unobstructed fit of the vial, into the lantern.
I have a few assembled tritium lanterns, in stainless steel, silver and bronze, available from my Etsy shop (tritium vial glued in place with Norland 61 and split ring installed). Please contact me if you would like an assembled lantern that is not present on Etsy.
There are some more photos of this object and other examples of my work, both 3D printed and otherwise, on my 'Tofty' facebook page.