The units from which this star is made, are folded from triangles whose angles are 30°, 60° and 90°. Such triangles are created when you cut a hexagon from a rectangle (e.g. an A4 sheet). Instead of throwing them away, you can use them for folding modular stars like this one. A few variants are possible (pictures coming up soon). There is a color change on each unit, and you can use different colors for the six units as well, so there are several interesting color combinations.
In order for the modules to fit well together, the triangles have to be cut quite precisely. When cutting a hexagon, you want precision anyway, so the leftover triangles will usually be precisely cut as well, but it seems minor imperfections are visible in the star made from the triangles more than in models folded from the equally imperfect hexagon. This is probably because the hexagon is bigger and folded into a larger grid which allows the errors to spread out a little.