Mini Voronoi Cylinder Cage 3.5×25mm

Cylinder with Voronoi pattern with an inner cavity, suitable to hold a 3.5×25mm cylinder inside (3.5mm diameter, 25mm axis length). In the picture, it holds a phosphorus coated vial of tritium (which is fluorescent).

The average diameter of each arc in the Voronoi pattern is 1.5mm. At any given height (along the cylinder axis), there are at least three arcs in the pattern sustaining the structure, to avoid easy breaking.