Next task on the Greenpiece BOM quilt was to add the pieced borders I made a few years back. When I went to pin on the side border, I noticed a mistake.
Can you see it? I did not trim away the bottom layer on the triangle corner when assembling, meaning a lot of bulk when added to the quilt top. Some very tedious surgery was required on the four long sections of pieced border.
Besides the triangle center, I sliver trimmed the seam allowance and used a pin to tease the fibers away from one side of the seamline and pull it free. You can see the difference with the triangle trimmed in this pic: