tapper

the quarter inch seam, that is!
I have tried all the tips and ideas. I have fiddled with tension, top and bottom, changed needles, used a seam guide and all to no avail. I have tried lining up the fabric a smidgen inside the ruler, a smidgen outside to come up with perfect size cut units. I've used different rulers, different threads, used layers of masking tape on the machine bed.
When I make a 9 patch block, it will be a bit smaller or a bit larger than the correct size. If it's bigger, I can sliver off a bit from all sizes but that's a hassle and doesn't work with star points.
I now believe that I just can't sew a straight line!

I was thinking about joining a swap group but my blocks would never be good enough.