I cut my OBW using the recommended 3.75 strip width. I had some surprising (alarming, disappointing) variations in the height of my blocks. Now that I have a 6.5" hexagon ruler, I wanted to use this ruler to trim down my blocks. My OBW blocks, even though carefully cut and sewn ended up with some
surprising wonkiness...Sewing 6 triangles with 12 edges of bias will do that
First I did my normal block at 3.75" with careful seams and pressing. Even though I exercised great care at all stages, I still ended up with "some here and less there" when I lay the ruler on top of the block.
I experimented with a 4" width. I had to trim too much off.
Next up. . . . I went with 3 7/8ths and that worked out perfectly. I cut just a small amount around to end up with a perfect 6.5" height block. I will use this size in the future to give myself some wiggle room. I really want my next whack at the OBW to be perfect, as I will gift it. Having a ruler to help me "square" the block up nicely will go along way toward improving the end result.
If you are making 6.5" OBW, I highly recommend a hexagon ruler and adding an extra 8th of an inch to your strip width. It gave me a perfect trim down with negligible waste.
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