String Quilt Blocks

I love the look of the string quilt block and how the 4 blocks form a pattern with just the strip in the center. I'm trying to use up the rest of this older Amy Butler Fabric and thought this would be a great way to use up scraps and my remaining yardage. This is my first finished block, although since this pic I finished 3 more!

this is a simple pattern and makes for easy sewing - I used this tutorial from Ashley at Film in the Fridge. The little tiny corners are also a great way to use those little triangles left over from mitering your binding!

These blocks are a tad more difficult to chain piece, for me at least. I tend to get 3-4 projects going and then spend time at the machine chain-piecing, then chain ironing and then re-pinning new pieces and then back to the machine. How do you do it? Do you just do one project or sew one piece, then iron then pin the next piece?