I'm working a on block of the month, where the finished block is supposed to be 15 1/2''. The first time I pieced three blocks, and they all came out to different sizes: 14'', 14.5'', 15''. So I investigated to see if I had a true 1/4 seam and I didn't, so I took out the blocks, and tried another block again, this time, trying to be careful with the 1/4'' seam... Well, my stupid block came out as 14.25-5''. I checked my 1/4'' seams and they were 1/4''.... I finally gave in and trimmed the block to 14'', because I couldn't get the right size.... does anybody have any ideas, why I keep getting different sizes?? Here is the block pattern:
