One useful tip was to adhere this narrow tape to the bed of the machine to provide a stitching guide for sewing an accurate diagonal seam across each square. You can see in the photo above, that by watching the point of the square and keeping it aligned with the tape, the line will stitched in just the right place. She also suggested starting at the center point, as above, to keep the machine from "chewing up" those corners. Once sewn, you can flip the triangle back on itself and press, and then trim away the bottom two layers to reduce bulk. But just in case your brain goes on a mini vacation while sewing, and the unit is not accurate, she suggests just trimming out the middle layer of the triangles. Doing this preserves the cut rectangle and keeps the unit precise. That happened in the unit at the upper left in the top photo. You can see a sliver of the red rectangle peaking out where I stitched slightly off the true diagonal. I like this method because it keeps the unit from becoming distorted or wonky, as we quilters like to say.
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