Diamonds in the Deep.
(Paper versions and PDFs purchased April 2017 and prior)
There is an error in the cutting diagram for the TWIN center squares.
There should be five (5) 3″ squares and fourteen (14) 1.5″ squares.
To correct, exchange one group of four 1.5″ squares for one 3″ square, and you’ll have what you need with no changes to the amount of fabric required.