This a Robin Star, version 2. It is made from eight folded and interlocked squares of paper. The structure was designed by Maria Sinayskaya and published on-line by her in December 2012.
I first came across the Robin Star when I was researching stars for the Byopia Press Advent Calendar 2017. It is a most satisfying structure: simple to fold, and the parts stay securely locked together after assembly with no need for glue.
The sample stars I made started with squares roughly 10 cm/4 in and produced stars approximately 14.5 cm/5.5 in across.
The alternative version (shown at the bottom of the instructions) with the reversed lower fold shows off bi-coloured paper nicely.