
I really enjoy using this ruler. I didn't make Cat's Cradle but I used it on Crazy Ann, Old Maid's Puzzle, Pershing and other building blocks. There is no wastage of fabric, the measurements of the cut pieces and the finished size are on the ruler. You get two perfect triangle-square-triangle angles with every cut, saving you tons of time and never cutting a triangle. Line designer is a genius! Easy-to-follow instructions with diagrams for each step are included with the ruler. I found the YouTube video helpful to see how the designer used the ruler. I've ordered one that goes up to a 4" finished block, but will be ordering a very large one, up to 10".

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