This is a derivative of
Chainmail by Zomboe
While Zomboe's thing uses square links on a square lattice, this one uses triangle links on a hexagonal lattice.
UPDATE June 6 2011 - At Zomboe's suggestion I chaged things so the vertical connections are trapezoids instead of small triangles. Hopefully this will make it easier to print. New Stls and OpenSCAD have been uploaded; the new files have "v2" in the filename.
OpenSCAD and Stls are provided. Given the number of tricks Zomboe had to use to get his to print, I think it is unlikely you can print from the large stl files alone.
I don't know if Skeinforge will repeat patterns on a hexagonal grid.
If you want to try stepping and repeating on a rectangular grid, you can try using the file "trimailRectangularUnitCell".