I'm experiencing the same issues with the diamon log cabin block- I have done 32 of them and the angles are not coming out right- I've checked my 1/4 distance from my needle, purchased two different 1/4 inch feet and still have issues- I'm strip piecing so I wonder if I'm cutting the angles to separate the pieces wrong but don't see another way to do it- Am I better off going block by block and not string piecing- Whats the best way to check the angles of the diamond?