The final block size at this point is supposed to be 6.5". How did I come to this number? The octagon triangles are start with a strip of fabric that is 3 15/16" wide. This is the height of the triangle. The bottom edge is 3 5/16".
The schematic below shows the initial triangle in blue. The left and right seam allowances are shown in green and pink. A final bottom seam allowance is shown in light green. The vertical measurement is half the final block dimension (6.08").
If we add the bottom seam allowance in, the block size before assembling the top should be 6.58".
Unfortunately, my blocks came in well under this size. I am pretty sure this has to do with how I 'measure' (eye-ball) a 1/4" seam allowance. I use the edge of my presser foot on the sewing machine. For this quilt, the smaller size is not an issue, but I need to resolve this for subsequent quilts. The blog Sew Mama Sew has a good post about how to achieve accurate seam allowances.
For this quilt, I trimmed each block to a 6.25" square.
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